HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Menke, J. Search for Related Content PubMed PubMed Citation Articles by Menke, J. Related Collections Related Article

Comparison of Different Body Size Parameters for Individual Dose Adaptation in Body CT of Adults¹

¹ From the Department of Diagnostic Radiology, University Hospital, Rosenwinkel 5, 37081 Goettingen, Germany. Received July 29, 2004; revision requested October 7; revision received October 17; accepted November 15. Address correspondence to the author (e-mail: Menke_J{at}T-Online.de).

PURPOSE: To investigate prospectively which of several body size parameters are suitable for individual dose adaptation in body computed tomography (CT) of adults.

MATERIALS AND METHODS: Three body regions (thorax, abdomen, pelvis) were scanned exclusively for clinical reasons, with institutional ethical approval and informed consent. For each of the three regions, 50 men and 50 women (aged 18–87 years) were studied (300 scans total). Individual x-ray properties for each scan were summarized with a water-equivalent diameter (D_w). Different body size parameters, based on weight, height, and shape, were correlated with D_w by using regression analysis. This resulted in D_w estimation errors of different magnitudes, indicated with 95% prediction intervals. The errors from weight were compared with those from each of the other body parameters by using comparison of variance in paired samples (P < .05). In addition, a topogram-based estimate for D_w was studied, which simulated an automated body size measurement.

RESULTS: For the thorax, abdomen, and pelvis, mean D_w was 28.0, 29.1, and 29.3 cm, and estimation of D_w from weight enabled 95% prediction intervals of ±2.5, ±2.4, and ±2.6 cm, respectively. Combinations of height and weight were only slightly more or even less exact than were measurements from only weight. Diameter-related parameters such as body circumference were similar to or better than weight. However, the topogram-based estimate was significantly more exact.

CONCLUSION: Body weight and circumference enable suitable estimates for individual dose adaptation in body CT of adults if automated dose adaptation is not available.

© RSNA, 2005

Related Article

What Parameters Are Most Accurate in Predicting Appropriate Technique Factors for CT Scanning?

John M. Boone
Radiology 2005 236: 377-378. [Full Text] [PDF]

This article has been cited by other articles:

				J BRANDBERG, L LONN, E BERGELIN, L SJOSTROM, E FORSSELL-ARONSSON, and G STARCK Accurate tissue area measurements with considerably reduced radiation dose achieved by patient-specific CT scan parameters Br. J. Radiol., October 1, 2008; 81(970): 801 - 808. [Abstract] [Full Text] [PDF]

				T. Kubo, P.-J. P. Lin, W. Stiller, M. Takahashi, H.-U. Kauczor, Y. Ohno, and H. Hatabu Radiation Dose Reduction in Chest CT: A Review Am. J. Roentgenol., February 1, 2008; 190(2): 335 - 343. [Abstract] [Full Text] [PDF]

				G. Hur, S. W. Hong, S. Y. Kim, Y. H. Kim, Y. J. Hwang, W. R. Lee, and S. J. Cha Uniform Image Quality Achieved by Tube Current Modulation Using SD of Attenuation in Coronary CT Angiography Am. J. Roentgenol., July 1, 2007; 189(1): 188 - 196. [Abstract] [Full Text] [PDF]

				J. M. Boone What Parameters Are Most Accurate in Predicting Appropriate Technique Factors for CT Scanning? Radiology, August 1, 2005; 236(2): 377 - 378. [Full Text] [PDF]