| Comparison of helical computerized tomography and plain radiography for estimating urinary stone size. | |
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MedLine Citation:
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PMID: 11832704 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: We evaluated the accuracy of noncontrast spiral computerized tomography (CT) for determining urinary stone size compared with plain x-ray. MATERIALS AND METHODS: We retrospectively analyzed noncontrast helical CT and plain x-ray of the kidneys, ureters and bladder images of 39 patients with urolithiasis who underwent each study from July 1997 to February 1999. Stone size on x-ray was measured in the craniocaudal and transverse dimensions by a single radiologist (I.C.B.). The size of the same stone was then determined on blinded noncontrast spiral CT images. Stones that were less than 3 mm. were excluded from study. On CT estimated craniocaudal dimension was based on collimation thickness, the reconstruction interval and the number of images on which the stone was visualized. RESULTS: We evaluated 58 stones 3 mm. or larger in the greatest dimension on plain x-ray of the kidneys, ureters and bladder, and noncontrast spiral CT, including 15 in the distal ureter, 7 in the mid or proximal ureter and 36 in the kidneys. Stone size was 3 to 18 mm. in the greatest dimension. Mean transverse dimension of the stone plus or minus standard deviation on noncontrast spiral CT was 5.1 +/- 1.08 versus 4.9 +/- 1.08 mm. on plain x-ray of the kidneys, ureters and bladder (paired t test; p = 0.335). The mean craniocaudal dimension on noncontrast spiral CT was 7.5 +/- 1.98 versus 6.7 +/- 1.98 mm. on plain x-ray paired t test (p = 0.005). CONCLUSIONS: Noncontrast spiral CT enables a similar measurement of stone size along the transverse dimension as plain x-ray of the kidneys, ureters and bladder. In individuals noncontrast spiral CT does not accurately measure the craniocaudal dimension of stones compared with plain x-ray when standard acquisition and reconstruction techniques are used. In this regard it has a tendency to overestimate stone size by an average of 0.8 mm. |
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Authors:
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Narendra Narepalem; Chandru P Sundaram; Illya C Boridy; Yan Yan; Jay P Heiken; Ralph V Clayman |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of urology Volume: 167 ISSN: 0022-5347 ISO Abbreviation: J. Urol. Publication Date: 2002 Mar |
Date Detail:
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Created Date: 2002-02-08 Completed Date: 2002-02-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376374 Medline TA: J Urol Country: United States |
Other Details:
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Languages: eng Pagination: 1235-8 Citation Subset: AIM; IM |
Affiliation:
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Department of Urology, Mallinkrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Humans Kidney Calculi / radiography Predictive Value of Tests Retrospective Studies Tomography, X-Ray Computed* Ureteral Calculi / radiography Urinary Bladder Calculi / radiography Urinary Calculi / radiography* |
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