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How does a radiopaque structure appear on a radiograph

Radiolucent (dark) air space, soft tissues, abscesses, tooth decay, and dental pulp appear as radiolucent images (dark). Radiopaque (white or light gray) body structures that radiation does not easily pass through appear radiopaque on an image (white or gray. What is a radiolucent structure How does a radiopaque structure appear on a radiograph? White. Which of the following is an example of a radiolucent structure? all of the above. The purpose of contrast medium is to. make a structure visible on a radiograph. All of the following are methods used to administer a contrast medium except

The radiopacity of various objects and tissues results in radiographs showing different radiopacities, and hence they can be differentiated. Radiopaque tissues/objects result in a whiter image; less radiopaque objects result in a blacker image. The radiopacity depends on How does a radiopaque structure appear on a radiograph? white. Which of the following is an example of a radiolucent structure? Lungs, urinary bladder, stomach, intestines. The purpose of contrast medium is to: Make a particular structure visible on a radiograph

What Is The Difference Between Radiopaque And Radiolucent

Chapter 14 (no matching) Flashcards Quizle

In the distal inferior portion of maxillary molarradiographs a large radiopaque structure may beseen. This is (P) the coronoid process of themandible (Fig. 10P, 11P, 13P). When is an eden-tolous radiograph, this landmark is helpful in deter-mining which is the most distal of the maxillary radi-ographs are better contrastand density of a radiograph, and a smaller area of tissue being exposed to radiation. The XCP ring should be close to the patient'sface, and the PID close to the ring of the XCP. XCP ring and PID close to the face. This image shows good contrast and density. PID is not close to face. This image does not show good contrast. The radiograph will display a range of densities from white, through various shades of grey, to black. Radiopaque tissues/objects appear more white and radiolucent tissues/objects appear more black. The resultant pattern of opacities forms an image on the radiograph, which is recognisable in form, and which can be interpreted The device is almost radiolucent at conventional radiography but is clearly visible at CT. On axial CT scans, it appears as a linear high-attenuation area , which might initially be mistaken for a drain. However, maximum intensity projection images clearly show its virtually pathognomonic flat and elliptic shape (52,53)

Structures that are cavities, depressions or openings in bone such as a sinus, fossa, canal or foramen will allow x-rays to penetrate through them and expose the receptor. These areas will appear radiolucentor black on radiographic images • Cancellous bone may extend into the tuberosity causing this structure to appear on radiograph as a thin shell of cortical bone. 6. Pterygoid plates and pterygoid hamulus: • Lateral pterygoid plate is wider than the medial plate and rarely seen on radiographs of max. 3rd molar region Radiopaque volumes of material have white appearance on radiographs, compared with the relatively darker appearance of radiolucent volumes. For example, on typical radiographs, bones look white or light gray (radiopaque), whereas muscle and skin look black or dark gray, being mostly invisible (radiolucent) Radiopaque jaw lesions are frequently encountered at radiography and computed tomography, but they are usually underevaluated or underdescribed in radiology reports. A systematic approach to the evaluation of radiopaque jaw lesions is necessary to diagnose the lesion or at least provide a meaningful differential diagnosis

Interpreting radiographs - Prior

Uncertain radiopaque opacity projecting over the right lung apex in a 3-year-old girl. (a) Frontal radiograph of the chest demonstrates a rounded radiopaque density over the right lung apical region (arrow). (b) Review of chest radiograph from 1 year back demonstrates that the radiopaque density was present (arrowhead) and is unchanged over one. a structure that stops or absorbs x-rays will appear: radiopaque (lighter areas) what type of x-ray produce the radiograph image in the form of a latent image: primary: the most penetrating x-rays have a: short wavelength: on which x-ray would an inverted Y (outline of nasal floor and anterior floor of maxillary sinus) be seen: maxillary. What does radiopaque and radiolucent mean? Radiolucent - Refers to structures that are less dense and permit the x-ray beam to pass through them. Radiopaque - Refers to structures that are dense and resist the passage of x-rays. Radiopaque structures appear light or white in a radiographic image. What materials are transparent to xrays. What appears radiolucent on a dental radiograph? Radiolucent - Refers to structures that are less dense and permit the x-ray beam to pass through them. Radiolucent structures appear dark or black in the radiographic image. Radiopaque - Refers to structures that are dense and resist the passage of x-rays Radiopaque structures appear light or white in a radiographic image. BONY LANDMARKS 1. Anterior nasal spine - a radiopaque V-shaped structure in the maxilla that intersects the floor of the nasal cavity and the nasal septum. External auditory meatus - a round radiolucent passage way to the ear (bilateral)

through them. Radiolucent structures appear dark or black in the radiographic image. Radiopaque - Refers to structures that are dense and resist the passage of x-rays. Radiopaque structures appear light or white in a radiographic image. Bony Landmarks1 Anterior nasal spine - a radiopaque V-shaped structure in the maxilla that intersects the. how does the lamina dura appear on a radiograph? appears as a dense radiopaque line in healthy tooth 2 how does the alveolar crest appear on a radiograph? - about 1.5-2 mm apical to the CEJ. Click here for the Professional Version. During imaging tests, contrast agents may be used to distinguish one tissue or structure from its surroundings or to provide greater detail. Contrast agents include. Radiopaque contrast agents (sometimes inaccurately called dyes): Substances that can be seen on x-rays Anatomical radiographic appearances. Foramina - round to ovoid radiolucent entities, may or may not have a radiopaque/corticated edge. Canals - radiolucent line or band, may or may not have radiopaque/corticated edge(s). Now on to the anterior portion of intraoral radiographs. Mandibl 1 RADIOGRAPHIC ERRORS AND ARTIFACTS.Neill Serman. August. 2000. Definition: An artifact is a structure or an appearance that is not normally present on the radiograph and is produced by artificial means. Radiographic errors may be due to technical errors [ errors related to the technique of taking the radiograph] or processing errors [related to all aspects of processing

Ch. 14 Radiology Flashcards Quizle

The radiograph machine should be positioned on the floor with the primary beam exactly midway between the toe wall and the heel bulbs, 1-2 cm above the surface of the hoof block/at least 2 cm below the coronary band, and parallel with the heel bulbs and the ground surface Plain radiography, mainly LNR, is a simple, inexpensive, and accessible technique that can be used to identify most FBs, confirming location, size, shape, and number and making further imaging unnecessary. The radiographic signs associated with FB ingestion are visualization of the FB itself, soft-tissue (prevertebral) swelling, and ectopic gas

Lower border - The lower border of the mandible appears as a radiopaque band of dense cortical bone demarcating the inferior aspect of the mandible. This structure can be observed on any mandibular periapical view, especially when the x-ray beam angulation is excessive Radiopaque objects block radiation rather than allow it to pass through. Metal, for instance, is radiopaque, so metal objects that a patient may have swallowed are visible on X-rays. Radiopaque dyes are used in radiology to enhance X-ray pictures of internal anatomic structures. The opposite of radiopaque is radiolucent Radiopaque volumes of material have white appearance on radiographs, compared with the relatively darker appearance of radiolucent volumes. For example, on typical radiographs, bones look white or light gray (radiopaque), whereas muscle and skin look black or dark gray, being mostly invisible (radiolucent). Though the term radiodensity is more. A posttreatment radiograph of tooth 3 showed a large titanium post in tooth 4 (Fig. 6). In this case, the surface retention features of the post are obscured by a relatively radiopaque cement. The space between the post and residual gutta-percha is 130 Kleier et al, FLG 5. Radiograph of tooth 31 with a titanium post in the distal root

Soft Tissue Calcifications. Soft tissue calcifications pop up all of the time, and it behooves the radiologist to say something intelligent about them. Fortunately the differential diagnosis for this finding is not too difficult. Soft tissue calcifications are usually caused by one of the following six entities How does the median palatien suture appear in a radiograph? radiolucent: Which regressive alteration of tooth structure appears radiolucent and occurs within the crown or roots of a tooth? internal resportion: In addition to the patient's name, what other information should be placed on the film mount? date of exposur The x-ray tube and cassette holder simultaneously move around the patient's head and, following the principle of laminagraphy, give a panoramic view of the upper and lower jaws without superimposition. In this study, a skull was held on the chin rest of the Panorex machine with radiolucent rubber bands (Fig. 1) which do not show on film Normal Anatomic landmarks on Panoramic Radiograph. The eye cannot see what the mind does not know. Sir William Osler, Late 1800s. Panoramic imaging (also called as orthopantomography or rotational radiography) produces a tomographic image of both the maxillary and the mandibular arches with their supporting structures in a single film

It depends. Possible yes, but only if the decay is beyond the edge if the crown that us at the gum line. It would be nice if most decay under a crown presented this way, but alas, it usually presents as a tiny failure at the gum line. Then it gets.. Mixed radiopaque & radiolucent lesions 1. Seminar on Mixed radiopaque - radiolucent lesions - By Samarth johari 2. Definitions Radiolucent : It refers to that portion of a processed radiograph which appears as dark / black. It is caused due to the passage of maximum photons through the objects

Radiography. The taking of permanent records of internal body organs and structures by passing xrays through the body to act on a specially sensitized film. Radiologist. A physician who specializes in the diagnosis and treatment of disease using radiation and other imaging techniques. Radiology What does radiopaque and radiolucent mean? Radiolucent - Refers to structures that are less dense and permit the x-ray beam to pass through them. Radiolucent structures appear dark or black in the radiographic image. Radiopaque - Refers to structures that are dense and resist the passage of x-rays Radiodensity (or radiopacity) is opacity to the radio wave and X-ray portion of the electromagnetic spectrum: that is, the relative inability of those kinds of electromagnetic radiation to pass through a particular material. Radiolucency or hypodensity indicates greater passage (greater transradiancy) to X-ray photons and is the analogue of transparency and translucency with visible light The greater any of these factors are, the more the x ray beam will be attenuated. The greater these qualities of the tissue or object/structure being imaged, the more x rays will be attenuated, and the more radiopaque' the tissue/object/structure will appear on the final imag

Radiographic features • Location: apex of the non-vital tooth, Maxilla,around incisors and canine Due to distal inclination of maxillary lateral incisor,may invaginate the maxillary antrum • Periphery and shape: well-defined cortical border • Internal structure:radiolucent Dystrophic calcification in long standing cases 22 The panoramic radiograph (Fig. 1) clearly showed a solitary mixed lesion containing both radiolucent and radiopaque components; however, the borders appeared well defined in some areas and ill defined in others. In addition, the internal structure was altered, but not clearly visible in this film which may be confirmed by the radiograph. Image hallmark If an exostosis is of sufficient size and density, it may appear as a well-defined radiopacity on the radiograph in the area of clinical change (Fig. 1). * Corresponding author. E-mail address: dkwhite@pop.uky.edu (D.K. White). 1061-3315/03/$ - see front matter 2003, Elsevier Science (USA)

Small Animal Elbow & Antebrachium Radiography (July/August 2012) Radiographs of the carpus and manus are needed for evaluation of traumatic injuries and swelling or lameness. Standard evaluation of the carpus and manus includes mediolateral and dorsalpalmar projections. The additional projections described aid in diagnosis of specific disease. radiopaque adjective Referring to a material or tissue that blocks passage of X-rays, and has a bone or near-bone density; radiopaque structures are white or nearly white on conventional X-rays Normal configuration of the affected teeth, results in decreased X-ray absorption in the areas in question. Perception of these areas is due to contrast with the adjacent ,relatively radiopaque enamel and alveolar - bone. It should not be confused with root caries which has similar appearance. www.indiandentalacademy.com 8

A grid with an 8:1 ratio will reduce x-ray exposure by a factor of 3; a 12:1 grid can do so by as much as a factor of 4. Once puppies or kittens reach 5 to 10 lb, the radiographic technique will not differ from that of any small patient. If digital radiography is used, the same basic aforementioned considerations apply The doughnut sign visualised on the lateral chest radiograph is formed by the normal right and left main pulmonary arteries and the posterior aspect of the aortic arch anteriorly and superiorly and hilar and subcarinal lymphadenopathy inferiorly, with the central radiolucent centre formed by the trachea and upper lobe bronchi (1-3) (Fig

The region of interest demonstrates a solitary, well-defined, regular, smooth, radiopaque entity apical to #20 is noted. The internal aspect is uniformly radiopaque and there is no radiolucent rim surrounding this entity. It doesn't appear to be causing any root resorption of #20 Ghost images are similar to the actual structure or object, but are blurry and appear higher on the opposite side of the radiograph; however, the structures or objects that produce ghost images may also appear on the panorex as a real image. 5,7,9,10,14 Ghost images may include metal objects not removed prior to the exposure, such as earrings. Purpose . To compare errors in digital panoramic radiographs of permanent and mixed dentitions. Methods . 143 and 146 digital radiographs of mixed and permanent dentitions were examined. Results . Significantly fewer errors presented in the mixed dentition. Positioning too forward significantly prevalent in the mixed dentition; slumped position and nonpositioning of chin properly were. Horizontal Beam/X-Ray Tube Radiograph. Positioning: The patient is positioned in dorsal recumbency using a V-trough; the pelvic limbs are flexed. The x-ray tube is rotated 90 degrees and placed in a horizontal position, situating the patella perpendicular to the cassette and x-ray tube head. A sandbag is placed over the tarsus and pes for. Panoramic radiography, also called panoramic x-ray, is a two-dimensional (2-D) dental x-ray examination that captures the entire mouth in a single image, including the teeth, upper and lower jaws, surrounding structures and tissues. The jaw is a curved structure similar to that of a horseshoe

The nose and forehead of your patient are touching the cassette while exposing a posteroanterior projection. A variation of this projection has the patient's nose and chin touching the cassette, with his/her mouth wide open How Do I Analyze a Radiograph of the Chest. First of all, it is important that you approach the CXR without fear—its analysis is not black magic. Secondly, you should always follow a rigid but commonsense sequence of image analysis in order to not miss an important finding. Why don't you stick to the following suggested scheme for now and try.

Chapter 28 final test Flashcards Quizle

All of the following are basic principles of the paralleling technique EXCEPT. A. A 16 extension or long cone must be used. B. The source of the x-ray must be directed perpendicularly to tooth and film. C. An 8 short cone must be used. D. The film must be parallel to the long axis of tooth Exposure to radiation no matter how small In dentistry, the ___ the wavelengths of the x-rays, the greater their energy and their usefulness., The term___ is used to describe areas that appear dark on the radiograph;___ is the term used to describe areas that appear white or light gray, A lead apron and thyroid collar must be used o radiolucent heart shaped between the two centrals. lateral fossa incisive fossa. bony depression on facial side of maxilla. soft tissue of nose. shadow of the nose radiopaque. Naris. opening of the nasal fossa, two elliptical areas. maxillary sinus location. premolar and molar area, posterior region radiolucent area

What does opacity refer to with a radiograph? 1. A lack of transparency; an opaque or nontransparent area. 2. On a radiograph, a more transparent area is interpreted as an opacity to x-rays in the body. What color is radiolucent? Radiopaque tissues/objects appear more white and radiolucent tissues/objects appear more black RADIOPAQUE LANDMARKS ON MAXILLARY RADIOGRAPHS. a. Maxillary Tuberosity. The maxillary tuberosity (see figure 3-25) is the convex distal inferior border of the maxilla, curving upward from the alveolar process and distal of the third molar. An extension of the maxillary sinus is occasionally seen within the maxillary tuberosity

Clinical ch. 13 and 14 Flashcards Quizle

does not depend on lead content, but rather on its density.4 Therefore, all glass foreign bodies are radiopaque, but with various degree of radiodensity. Metal foreign bodies are almost always radiopaque, with the exception of thin aluminum metal, which has a lower radiodensity and a lower sensitivity for detection on radiographs. X-ray artifacts Dr Mohammad Taghi Niknejad and Dr Aditya Shetty et al. There are common and distinct artifacts for film , computed (CR) and digital radiography (DR) Lecture 1: One step in the formation of a differential diagnosis is to describe the lesion's presentation, does it appear radiolucent, radiopaque, or does it have characteristics of both radiolucency and radiopacity? Lecture 2: A radiolucency associated with the apex of a non-vital tooth represents the image of apical periodontitis

Radiographic signs of bronchial pattern: 1. Thickened, end-on bronchi appear as rings, or do-nuts 2. Thickened bronchi seen longitudinally appear as parallel radiopaque lines, sometimes referred to as railroad tracks Right lateral radiograph of a dog with chronic bronchitis How does an interstitial lung pattern appear on a radiograph: rings and lines, dark open space, crosshatched lines, or hazy and indistinct? Hazy and indistinct - because an interstitial lung pattern occurs when the patient's disease is located in the tissues outside of the air-containing spaces At radiography, either type of ossifying fibroma can appear lucent, opaque, or of mixed opacity depending on the degree of calcification within the mass. Incipient lesions may appear lucent initially ( , , , , Fig 12 ); however, if untreated, over time they will usually exhibit increasing opaque foci that appear to coalesce depending on the projection. Knowledge of normal radiographic anatomy will help avoid over interpretation. Normal alveolar bone will appear gray and relatively uniform throughout the arcade. It is slightly more radiopaque darker than tooth roots. In addition, it appears slightly but regularly mottled

Med Lab 2 Chapter 28 Flashcards Quizle

There are four major categories of radiographic densities that appear on a radiograph; in order of decreasing density these are metal or bone, water, fat, and gas (or air). 3 Metal is extremely dense, and it is the most radiopaque of materials. Pure metals block or absorb the entire x-ray beam and produce a bright white shadow on the radiograph All glass is radiopaque 7. Epidemiology. The prevalence of glass foreign bodies in wounds from injury has been recorded at a rate of 1.5% in superficial (subcutaneous) wounds and 7.5% of deeper wounds 1. They make up ~15% (range 9-24%) of all retained foreign bodies 10. Radiographic features Plain radiograph commonly appear on panoramic. Panoramic radiograph showing a round radiopaque structure projected over the right mandibular ramus. (b) Cone- Due to the angulation of X-ray projection of.

Interpretation of panoramic radiographs - Perschbacher

Mandibular Canal. The mandibular canal (see figure 3-28) appears as a dark band with radiopaque borders running downward and forward from the mandibular foramen in the ramus to the region of the bicuspid teeth in the body of the mandible. It may be seen below the roots of the posterior teeth. Figure 3-28. Mandibular canal These structures appear on a properly positioned Panorex radiograph as radiolucent areas; therefore, the radiopaque reverse image is due to the radiopaque markers and not the anatomic structures themselves and probably would not create a diagnostic problem 1. Introduction. The ability to image radiopaque medical implants in vivo with X-ray radiography enables clinicians to conveniently, inexpensively and non-invasively monitor implant performance, wound healing and regeneration. In addition, the internal microstructure of radiopaque implants can be analyzed in vitro with X-ray microcomputed tomography (μCT)

Radiolucent Landmarks - Welcome to Dental Radiograph

  1. al x ray film refers to pathologi-cal calcification. This almost exclusivel
  2. An artificial tooth is provided that mimic the essential features of natural a tooth for use in training dental professionals. The artificial tooth is a radiopaque artificial tooth that is capable of providing for anatomically correct contrast on a radiograph. The artificial tooth also mimics the hardness, debris characteristics, and anatomical features of a natural tooth
  3. The lateral radiograph of the stifle shows a radiopaque structure overlying the cranial joint space. This proved to be a small stone lodged in the subcutaneous tissues. Diagnosis: foreign body. E, This dog had a swelling in the area of the thigh. A lateral radiograph shows a fat mass within the soft tissues caudal to the femur. Diagnosis: lipoma

Clin II Final Exam Review - eQuizSho

is the part of x-ray machine that produces x-rays: why is exposure to x-ray dangerous ? radiation can --- destroy tissue, harmful to developing embryos, can damage eyes, and bone marrow, and skin: if x-ray does not penetrate a structure easily, is termed ? radiopaque: what test is performed in order to to study colon for disease ? barium enem The purpose of this article is to provide an imaging approach to acquired causes of acute airway obstruction in children, including (a) abnormalities affecting the upper portion of the airway, such as croup, acute epiglottitis, retropharyngeal infection, and foreign bodies, and (b) abnormalities affecting the lower portion of the airway, such.

X-Rays - Physiopedi

On the survey radiograph in a direct projection, almost all along the top 5-6 pairs of ribs appear. Each of them can be distinguished body, front and back ends. The lower ribs are partially or completely hidden behind the mediastinal shadow and organs located in the sub-diaphragmatic space Teaching points • Panoramic X-rays, CT and MRI are essential for the work-up of radiolucent mandibular lesions. • Lesion borders, location within the mandible, relationship to dental structures and tissue characteristics on cross-sectional imaging are indispensable to narrow the differential diagnosis. • High-resolution CT and CBCT play a major role for the assessment of lesion margins. The 5 X-ray densities. Hover on/off image to show/hide findings. Tap on/off image to show/hide findings. Click image to align with top of page. The 5 X-ray densities. Low density material such as air is represented as black on the final radiograph. Very dense material such as metal or contrast material is represented as white The prevalence in the general population is approximately 1% (Figure 9). 13,14 Theoretically, sialoliths arise from deposition of calcium salts around a nidus of debris within the duct lumen. 15 Most salivary stones are found in the submandibular gland and appear as radiopaque masses, typically superimposed over the mandible (a) PA radiograph of chest shows lobulated margins (white arrows) of the mediastinum with obscuration of the hilar vessels producing the radiologic sign, hilum overlay sign. (b) Coronal and (c) axial images of contrast-enhanced CT scan of the chest show large nodal masses in the mediastinum (white arrows) obscuring the hilar vessels

Foreign Objects Encountered in the Abdominal Cavity at CT

  1. 1. Choose the most appropriate orientation for the radiograph shown below. A. Rotate the image 90 degrees clockwise. B. Rotate the image 180 degrees. C. Rotate the image 90 degrees counterclockwise. D. The image should remain as it is. 2. What structure does the radiograph in Question 1 show? A. Right maxillary canine tooth. B. Left maxillary.
  2. not calcified, so it does not appear as radiopaque as the walls of the nasal cavity. Where the concha are very large, the thickness of the soft tissue may make it look slightly opaque. (H) The lateral fossa (Fig. 4H) is a depres-sion in the labial plate in the lateral incisor region. It appears as radiolucency between th
  3. Radiography is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation to view the internal form of an object.Applications of radiography include medical radiography (diagnostic and therapeutic) and industrial radiography.Similar techniques are used in airport security (where body scanners generally use backscatter X-ray)
  4. The radiopaque contrast agent makes the tissue or structure being imaged appear more radiopaque (whiter) than surrounding tissues, so that it can be better seen on an x-ray. In conventional angiography , x-rays are taken after a radiopaque contrast agent is injected into blood vessels
  5. The incorporation of a radiopaque substance in the polythene has also been tried. Roentgen opaque polythene tubing sup- plied by the American Cystoscopic Makers Inc. (ACMI), for example, was found on crystallographic analysis, to contain barium. This tubing does not appear to be sufficiently radiopaque for intravascular use. O
  6. ation, they appear as well-circumscribed radiopaque masses that are round or ovoid in shape. [6] Histologically, osteomas may be divided into two types: (a) Compact or ivory and (b) cancellous, trabecular or spongy

Radiopaque Lesions - SlideShar

  1. Quia - Radiology I Review. Java Games: Flashcards, matching, concentration, and word search. A. B. Name one of the two basic rules for safety and protection. Never do anything to your patient that you would not like to have done to you; it is easier to do it right the first time than to explain why you did it wrong. Name one of the four.
  2. Radiolucent - Refers to structures that are less dense and permit the x-ray beam to pass through them. Radiolucent structures appear dark or black in the radiographic image. Radiopaque - Refers to structures that are dense and resist the passage of x-rays
  3. Purpose. The generation of x-rays for diagnostic imaging, formation of the radiographic image, and pharmacodynamics of radiopaque drugs are reviewed. Summary. Medical radiographic imaging uses x-rays to obtain an image of a particular structure or function of the human body. Darkening of the radiographic image occurs at points that correspond.
  4. Adult chronic hip pain can be difficult to attribute to a specific cause, both clinically and radiographically. Yet, there are often subtle radiographic signs that point to traumatic, infectious, arthritic, neoplastic, congenital, or other causes. Stress fractures appear as a lucent line surrounded by sclerosis or as subtle lucency or sclerosis
  5. ium stepwedge were placed on each film . The dental x-ray unit (Spectro 70X, Dabi Atlante, Ribeirão Preto, SP, Brazil) was set at 60 kVp, a current of 10 mA, and a standard exposure time of 0.4 seconds
  6. Objectives This study aimed to assess the prevalence of incidental findings, not strictly related to dentistry, viewed with panoramic radiography. Methods Panoramic radiographs performed between December 2013 and June 2016 were retrospectively collected. These images were analyzed, searching for incidental findings. All the information collected was statistically analysed Results A total of.

Radiolucent vs. Radiopaque - What's the difference? Ask ..

It depends on the density of what is in there. I have xrayed many rectal foreign bodies during my career. Most show up clearly, but some do not. I have seen a myriad of objects, and the one that stood out was the one that xrays did NOT see. It was.. radiopaque: obstructing the passage of radiant energy, such as x-rays, the representative areas appearing light or white on the exposed film