By Ronald Eisenberg JD MD FACR, Alexander Margulis MD
Scientific imaging now performs an incredible function in analysis, selection of remedy, and follow-up. although, sufferers are usually intimidated by way of the a number of imaging modalities on hand, the indicators for his or her use, the enforcing gear, what the examinations are like and the way lengthy they final, and the benefits and drawbacks of varied techniques. This e-book is designed to supply causes for those and different matters on the way to relieve a few of the nervousness on the topic of scientific imaging stories.
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Extra resources for A Patient's Guide to Medical Imaging
In the United States, more than 150,000 CT studies are performed each day. 5 Americans. Table 1-2 Background Radiation Equivalents of Radiographic Studies Procedure Background radiation Bone densitometry (DEXA) 1 day Mammography 3 months Hysterosalpingography 4 months Spine radiograph 6 months Upper gastrointestinal series 8 months Barium enema 16 months CTomputed (head) 8 months CT (chest or abdomen) 3 years 18 A PATIENT’S GUIDE TO MEDICAL IMAGING The increase in CT examinations is related to the development of multidetector scanners, which can provide exquisitely detailed anatomic studies in a few seconds.
However, serious problems remained. Spending hours peering at a dimly ﬂuorescing screen caused signiﬁcant eyestrain, and prolonged exposure to radiation from unshielded x-ray tubes often led to serious injury. The development of the x-ray image intensiﬁer and the television camera in the 1950s completely revolutionized the use of ﬂuoroscopy in clinical diagnosis. Image intensiﬁers permitted the light produced by the ﬂuoroscopic screen to be dramatically ampliﬁed so that images could be seen even in a lighted room without prior dark adaptation.
If a swallowing abnormality is identiﬁed, the speech therapist may suggest an appropriate treatment strategy to make eating and drinking safer and more efﬁcient. For example, you may be asked to change the position of your head or body before swallowing. At times, merely changing the consistency of the food will allow you to eat safely and prevent aspiration. 42 A PATIENT’S GUIDE TO MEDICAL IMAGING Figure 2-15. Video esophagram. Aspiration of barium from the esophagus into the respiratory tract (arrow) in a patient who had sustained serious facial injuries.