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Image appears stretched out
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- In elongation the image appears stretched out when it is compared to the object. On the radiograph an elongated bone appears longer and skinnier than it actually is.
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Feb 20, 2016 · If the object being imaged is not parallel to the image receptor it will be magnified; however, each end will be magnified differently and this will produce distortion. This may be elongation or foreshortening of the image .
‘Unfolding’ of the aorta – a common X-ray finding in elderly patients – is a phenomenon which arises due to elongation of the ascending aorta with age. It is not usually considered a pathological finding in itself and should not be mistaken for an aortic aneurysm.
- Introduction
- Other Uses of X Rays For Imaging
- Physiotherapy Use
- Formation of Radiographs
- Radiopacity
- Potential Areas For Film and/or Processing Errors
- Resources
X-rays are a type of radiation called electromagnetic waves (with wavelengths ranging from 0.01 to 10 nanometers). X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Calcium in bones absorbs...
Fluoroscopy 1. Produces real-time images of internal structures of the body in a similar fashion to radiography, but employs a constant input of x-rays, at a lower dose rate to provide moving projection radiographs of lower quality. Contrast media, such as barium, iodine, and air are used to visualize internal organs as they work. Fluoroscopy is ma...
In terms of physiotherapy, X-rays are especially useful in detecting and monitoring pathologies of the skeletal system as well as the respiratorysystem.
X-ray photons have the potential to penetrate tissue and will be attenuated in part by the tissue, and in part will pass through the tissue to interact with and expose the radiographic film. Absorption of X-rays is a function of the atomic number and thickness of the tissues/objects. Tissues/objects with a higher atomic number will absorb more radi...
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 the atomic number (the higher the atomic number, the more radiopaque the tissu...
Heel effect – a source of visual error related to x-ray production, due to the fact that x-rays released by the machine are not uniform. There are two ends to an x-ray machine, a cathode end and an...Artefact – An error in the perception of the visual image of the radiograph, usually seen as an abnormal finding or foreign body. Artifacts occur when the cassettes that house the x-ray film plates...Exposure – A measure of the amount of ionising radiation determined by 3 factors: time, x-ray energy, and the quantity of the x-ray photons. Exposure can be manipulated by the technician to highlig...Movement – A blurring in the image as a result of movement by the patient the moment the x-ray exposure is made.The Norwich Image Interpretation Course. This is a great free online course on x-ray interpretation by Heidi Gable DCR(R) PgCert from the Norfolk & Norwich University Hospital NHS Trust.
Elongation. Elongation or lengthening of the teeth and surrounding structures results from underangulation of the x-ray beam (not enough vertical angle). When elongation occurs using the paralleling technique, the angulation of the x-ray beam is less than the long axis plane of the teeth.
Elongation was most pronounced in the proximal descending aorta, which showed an almost 2.5-fold length increase during life. The lengthening of the thoracic aorta was accompanied by a marked change of its geometry: whereas the aortic apex was located between the branch vessels in younger patients, it shifted to a more distalward position in ...
Oct 10, 2021 · 1. Contrast is the difference in the displayed or image signal intensity between two areas of interest e.g. a lesion and background tissue. A high contrast image has a greater difference between the grey shades displayed but a smaller range of greys.
