Evaluation of small (≤ 3 cm) renal masses with MDCT: Benefits of thin overlapping reconstructions

Masahiro Jinzaki, Jeffrey D. McTavish, Kelly H. Zou, Philip F. Judy, Stuart G. Silverman

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Abstract

OBJECTIVE. Our purpose was to determine whether thin overlapping reconstructions using MDCT improve the detection and characterization of small renal masses. MATERIALS AND METHODS. Thirty-seven patients were scanned with MDCT using 2.5-mm collimation. Nephrographic phase data were reconstructed in two ways: a standard protocol (5-mm section thickness, no overlap) and an experimental protocol (3-mm section thickness, 50% overlap). Masses were detected and classified into three groups: group 1, measuring less than 20 H on both protocols (classified as cysts on both); group 2, measuring 20 H or greater on standard protocol and less than 20 H on experimental protocol (classified as cysts using experimental protocol only); and group 3, measuring 20 H or greater on both protocols (not classified as cysts using either protocol). Masses 10 mm or larger in group 3 were evaluated further for enhancement. Statistically significant differences between protocols were assessed using an analysis of counts and proportions. RESULTS. Of 175 detected lesions, 29 (17%) were detected only with the experimental protocol; all but one were smaller than 5 mm. Using the experimental protocol, of 45 masses between 5 and 10 mm, the number of masses that could be characterized as cysts increased from 13 (29%) to 38 (84%). The overall number of indeterminate lesions was reduced from 101 (69%) of 146 lesions detected with the standard protocol to 86 (53%) of 161 lesions detected with the experimental protocol. CONCLUSION. Using MDCT and thin overlapping reconstructions, renal cysts as small as 5 mm can be diagnosed with more confidence than is possible with standard reconstructions, and the overall number of indeterminate renal masses is reduced.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalAmerican Journal of Roentgenology
Volume183
Issue number1
Publication statusPublished - 2004 Jul

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Cysts
Kidney

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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Evaluation of small (≤ 3 cm) renal masses with MDCT : Benefits of thin overlapping reconstructions. / Jinzaki, Masahiro; McTavish, Jeffrey D.; Zou, Kelly H.; Judy, Philip F.; Silverman, Stuart G.

In: American Journal of Roentgenology, Vol. 183, No. 1, 07.2004, p. 223-228.

Research output: Contribution to journalArticle

Jinzaki, Masahiro ; McTavish, Jeffrey D. ; Zou, Kelly H. ; Judy, Philip F. ; Silverman, Stuart G. / Evaluation of small (≤ 3 cm) renal masses with MDCT : Benefits of thin overlapping reconstructions. In: American Journal of Roentgenology. 2004 ; Vol. 183, No. 1. pp. 223-228.
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abstract = "OBJECTIVE. Our purpose was to determine whether thin overlapping reconstructions using MDCT improve the detection and characterization of small renal masses. MATERIALS AND METHODS. Thirty-seven patients were scanned with MDCT using 2.5-mm collimation. Nephrographic phase data were reconstructed in two ways: a standard protocol (5-mm section thickness, no overlap) and an experimental protocol (3-mm section thickness, 50{\%} overlap). Masses were detected and classified into three groups: group 1, measuring less than 20 H on both protocols (classified as cysts on both); group 2, measuring 20 H or greater on standard protocol and less than 20 H on experimental protocol (classified as cysts using experimental protocol only); and group 3, measuring 20 H or greater on both protocols (not classified as cysts using either protocol). Masses 10 mm or larger in group 3 were evaluated further for enhancement. Statistically significant differences between protocols were assessed using an analysis of counts and proportions. RESULTS. Of 175 detected lesions, 29 (17{\%}) were detected only with the experimental protocol; all but one were smaller than 5 mm. Using the experimental protocol, of 45 masses between 5 and 10 mm, the number of masses that could be characterized as cysts increased from 13 (29{\%}) to 38 (84{\%}). The overall number of indeterminate lesions was reduced from 101 (69{\%}) of 146 lesions detected with the standard protocol to 86 (53{\%}) of 161 lesions detected with the experimental protocol. CONCLUSION. Using MDCT and thin overlapping reconstructions, renal cysts as small as 5 mm can be diagnosed with more confidence than is possible with standard reconstructions, and the overall number of indeterminate renal masses is reduced.",
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