AJR. American journal of roentgenology
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AJR Am J Roentgenol · Jan 2002
Comparative StudyComparison of intraarterial and IV gadolinium-enhanced MR angiography with digital subtraction angiography for the detection of renal artery stenosis in pigs.
Catheter-based intraarterial injections of gadolinium are useful during MR imaging-guided endovascular procedures to generate rapid vascular road maps. Using an animal model of renal artery stenosis, we tested the hypothesis that intraarterial gadolinium-enhanced MR angiography is as accurate as IV gadolinium-enhanced MR angiography and digital subtraction angiography (DSA). We also tested the hypothesis that intraarterial MR angiography uses less gadolinium than IV MR angiography. ⋯ In swine, IV and intraarterial MR angiography have a similar accuracy for detecting renal artery stenosis. Intraarterial MR angiography uses smaller doses of injected gadolinium.
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AJR Am J Roentgenol · Jan 2002
The "flat cava" sign revisited: what is its significance in patients without trauma?
The purpose of this study was to evaluate the clinical significance of the "flat cava" sign on abdominal CT scans in hospitalized patients without trauma. ⋯ Of the 500 inpatients, 14% had a flat cava sign on at least one of the four levels examined on abdominal CT scans. The majority of these patients with a flat cava sign did not have hypotension or evidence of hypovolemia, but a minority (30%) did.
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AJR Am J Roentgenol · Jan 2002
Comparative StudyUsing a sterile disposable protective surgical drape for reduction of radiation exposure to interventionalists.
The purpose of this paper is to show the effectiveness of a new radiation protection method designed to decrease the amount of scatter radiation received by practitioners performing procedures under fluoroscopic guidance. ⋯ Depending on the procedure, the height of the practitioner, and the positioning of the radiation-attenuating surgical drape, use of this drape can substantially reduce the radiation dose to personnel with minimal or no additional radiation exposure to the patient.
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AJR Am J Roentgenol · Jan 2002
Relationship of spontaneous passage of ureteral calculi to stone size and location as revealed by unenhanced helical CT.
Prior studies using radiography have examined the relationship of ureteral stone size and location to the probability of spontaneous passage. Given the improved accuracy and new role of unenhanced CT in the diagnosis of acute ureterolithiasis, we studied the relationship of stone size and location as determined by unenhanced CT to the rate of spontaneous passage. ⋯ The rate of spontaneous passage of ureteral stones does vary with stone size and location as determined by CT. These rates are similar to those previously published based on radiography.