By Ronald Eisenberg JD MD FACR, Alexander Margulis MD
Clinical imaging now performs a big position in prognosis, number of treatment, and follow-up. notwithstanding, sufferers are frequently intimidated by means of the a number of imaging modalities on hand, the indicators for his or her use, the enforcing apparatus, what the examinations are like and the way lengthy they final, and the benefits and drawbacks of varied techniques. This booklet is designed to supply factors for those and different matters for you to relieve many of the anxiousness relating to scientific imaging experiences.
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Additional info for A Patient's Guide to Medical Imaging
Figure 2-12. Modern ﬂuoroscopy machine. The images are visible on the monitors at the far left. 36 A PATIENT’S GUIDE TO MEDICAL IMAGING Advantages and Disadvantages of Fluoroscopy Advantages • Real-time imaging • Ability to reposition the x-ray ﬁeld instantly during an examination Disadvantages • Less detail than ordinary radiographic images Risks of the Procedure Examinations using ﬂuoroscopy take much longer to perform than ordinary radiographic studies. Some may take 30 minutes or more compared with an exposure of less than 1 second for a chest or bone radiograph.
In an enteroclysis study, the tube is positioned in the small bowel using the ﬂuoroscope. How Is the Test Performed? If a small bowel study is performed in combination with an upper GI series, see the description in that section (p. 44). After the upper GI series is completed, you will be given several more cups of barium to drink. Radiographs will be taken every 15–30 minutes until there has been adequate ﬁlling of the entire small bowel. The radiologist may then ﬂuoroscope the end of your small bowel (terminal ileum), which is often involved with inﬂammatory diseases such as Crohn’s disease, pressing gently on your abdomen with a hand or plastic paddle to separate overlapping loops.
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.
A Patient's Guide to Medical Imaging by Ronald Eisenberg JD MD FACR, Alexander Margulis MD