Chapter 3 Section C

The ER physician suspects that a patient has a kidney stone. The patient is sent to the radiology department to confirm the diagnosis. What specific positioning routine would be used to rule out the presence of a kidney stone?

A KUB would be performed with the correct exposure factors to visualize the possible stone.

A patient in intensive care may have developed intra- abdominal bleeding. The patient is in critical condition and cannot go to the radiology department. The physician has ordered a portable study of the abdomen. Which specific position or projection can be used to determine the extent of the bleeding?

A bedside portable left lateral decubitus projection could be performed to demonstrate any fluid levels in the abdomen.

A patient with a history of ascites comes to the radiology department. Which of the following positions best demonstrates this condition? A. Erect AP abdomen B. Erect PA chest C. Supine KUB D. Prone KUB

A. The erect AP abdomen position best demonstrates air-fluid levels.

A KUB radiograph shows that the gonadal shielding is superior to the upper margin of the symphysis pubis. The female patient has a history of kidney stones. What is the next step the technologist should take? A. Accept the radiograph because the shielding did not obscure the kidneys. B. Repeat the exposure without using gonadal shielding. C. Repeat the exposure only if the patient complains of pain in the lower abdomen. D. Repeat the exposure with gonadal shielding, but position it below the symphysis pubis.

B. Because the patient may have renal calculi in the distal ureters and urinary bladder, gonadal shielding cannot be used.

A patient comes from the ER with a large distended abdomen caused by an ileus. The physician suspects that the distention is caused by a large amount of bowel gas that is trapped in the small intestine. The exposure factors for a KUB on an average, healthy adult is 76 kVp, 30 mAs. Should the technologist change any of these exposure factors for this patient? (Automatic exposure control [AEC] is not being used.) A. No. Use the standard exposure settings. B. Yes. Decrease the milliamperage seconds (mAs). C. Yes. Increase the milliamperage seconds (mAs). D. Yes. Increase the kilovoltage (kVp).

B. Yes. Decrease the milliamperage seconds (mAs).

A child goes to radiology for an abdomen study. It is possible that he swallowed a coin. The ER physician believes it may be in the upper GI tract. Which of the following routines would best identify the location of the coin? A. KUB and left lateral decubitus B. Acute abdominal series C. KUB and lateral abdomen D. Supine and erect KUB

C. KUB and lateral abdomen

An obese patient comes to the radiology department for a KUB. The radiograph shows that the symphysis pubis is included on the image, but the upper abdomen, including the kidneys, is cut off. What is the next step the technologist should take? A. Accept the radiograph. B. Repeat the exposure, but expose it during inspiration to force the kidneys lower into the abdomen. C. Ask the radiologist whether the upper abdomen really needs to be seen. Repeat only if requested. D. Repeat the exposure. Use two landscape aligned 14- × 17-inch (35- × 43-cm) image receptors to include the entire abdomen.

D. Repeat the exposure. Use two landscape aligned 14- × 17-inch (35- × 43-cm) image receptors to include the entire abdomen.

A KUB radiograph shows that the symphysis pubis was cut off along the bottom of the image. Is this an acceptable radiograph? If it is not, how can this problem be prevented during the repeat exposure?

No. A KUB must include the symphysis pubis on the radiograph to ensure that the bladder is seen. The positioning error involves centering of the central ray to the iliac crest. The technologist should also palpate the symphysis pubis (if permitted by institutional policy) or greater trochanter to ensure that it is above the bottom of the cassette.

A radiograph of an AP abdomen shows the left iliac wing is more narrowed than the right. What specific positioning error caused this?

Patient was rotated into a slight (RPO) (The downside ilium will appear wider.)

A radiographic image of an AP projection of the abdomen demonstrates motion. The following exposure factors were selected: 78 kVp, 200 mA, 2/10 second, grid, and 40-inch (100-cm) SID. The technologist is sure that the patient did not breathe or move during the exposure. What may have caused this blurriness? What can be done to correct this problem on the repeat exposure?

The blurriness may be caused by involuntary motion. To control this motion, the technologist needs to increase the milliamperage and decrease the exposure time (e.g., 400 mA at 1/10 second).

A radiograph of an AP projection of an average-size adult abdomen was produced using the following exposure factors: 100 kVp, 400 mA, 1/10 second, grid, and 40-inch (100-cm) SID. The overall density of the radiograph was acceptable, but the soft tissue structures, such as the psoas muscles and kidneys, were not visible. Which adjustment to the technical considerations enhances the visibility of these structures on the repeat exposure?

The selected kilovoltage (100 kVp) was too high. The technologist needs to lower the kilovoltage to 80 +/− 5 kVp. The milliamperage and exposure time can be altered to maintain the density.

A patient with a possible dynamic ileus enters the emergency room. The patient is able to stand. The physician has ordered an acute abdominal series. What specific positioning routine should be used?

The three-way acute abdominal series, including the (AP) supine and erect abdomen and (PA) erect chest projections.

A patient with a possible perforated duodenal ulcer enters the emergency room. The ER physician is concerned about the presence of free air in the abdomen. The patient is in severe pain and cannot stand. What positioning routine should be used to diagnose this condition?

The two-way acute abdomen series: AP supine abdomen and left lateral decubitus.