By Ronald Eisenberg JD MD FACR, Alexander Margulis MD
Scientific imaging now performs a tremendous function in analysis, selection of treatment, and follow-up. even though, sufferers are frequently intimidated by way of the a number of imaging modalities to be had, the symptoms for his or her use, the implementing apparatus, what the examinations are like and the way lengthy they final, and the benefits and downsides of assorted strategies. This e-book is designed to supply reasons for those and different matters that allows you to relieve the various anxiousness with regards to scientific imaging stories.
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Extra info for A Patient's Guide to Medical Imaging
In humans, there is no direct evidence of radiation-induced genetic effects even at high doses. Even if there is some effect, it is much less than the other risks associated with radiation and is easily outweighed by the beneﬁts gained from appropriate imaging studies. Therefore, the techniques used to protect the exposed person from harm are also effective in protecting future generations. However, for examinations of children and of adults of reproductive age, the gonads (ovaries of women and testicles of men) must be shielded from radiation, usually with a lead apron.
At times, the patient may be asked to lie on the side, with the cassette placed behind the back and the x-ray tube positioned in front so that the beam is parallel to the bed. This so-called lateral decubitus view is used to evaluate the amount of ﬂuid in the pleural space or to determine whether there is any free air in the abdomen that indicates a perforated bowel. If at all possible, every effort should be made to obtain all x-ray images in the radiology department, because portable ﬁlms are generally of poorer quality than those taken with permanent equipment.
Narrowing of all the interphalangeal joints with hypertrophic spurring indicates severe degenerative disease. Figure 2-6. Small bowel obstruction. Two views show prominent dilatation of small bowel loops without any gas distally, consistent with a complete obstruction. Characteristic airﬂuid levels are seen on the upright image on the right. 28 A PATIENT’S GUIDE TO MEDICAL IMAGING Figure 2-7. Pneumoperitoneum. Large amount of free gas in the peritoneal cavity from an intestinal perforation outlines the top of the liver and spleen and the underside of the diaphragm.
A Patient's Guide to Medical Imaging by Ronald Eisenberg JD MD FACR, Alexander Margulis MD