INTRAOBSERVER AND INTEROBSERVER VARIABILITY OF MR IMAGING-DERIVED ANDCT-DERIVED PROSTATE VOLUMES AFTER TRANSPERINEAL INTERSTITIAL PERMANENT PROSTATE BRACHYTHERAPY

Citation
Df. Dubois et al., INTRAOBSERVER AND INTEROBSERVER VARIABILITY OF MR IMAGING-DERIVED ANDCT-DERIVED PROSTATE VOLUMES AFTER TRANSPERINEAL INTERSTITIAL PERMANENT PROSTATE BRACHYTHERAPY, Radiology, 207(3), 1998, pp. 785-789
Citations number
16
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging
Journal title
ISSN journal
00338419
Volume
207
Issue
3
Year of publication
1998
Pages
785 - 789
Database
ISI
SICI code
0033-8419(1998)207:3<785:IAIVOM>2.0.ZU;2-X
Abstract
PURPOSE: To evaluate the relative accuracy and precision of magnetic r esonance (MR) imaging and computed tomography (CT) in the assessment o f postimplantation prostate volume by determining intraobserver, inter observer, and intermodality variations. MATERIALS AND METHODS: CT and MR images of 41 consecutive patients, after transperineal interstitial permanent prostate brachytherapy, were evaluated by two physicians to determine interobserver and intermodality variability in prostate vol ume measurements. Repeat evaluation in five randomly selected patients was used to determine intraobserver variability. RESULTS: Observer 1 versus 2 CT-determined mean prostate volume difference was statistical ly significant (-8.5 cm(3)+/-9.7[standard deviation],P <.001);observer 1 versus 2 MR-determined mean prostate volume difference was not sign ificant (1.9cm(3)+/-11.7,P = .492). CT intraobserver range of dimensio nal errors was 3.5 and 11.4 times that of MR imaging. Observer 1 CT an d MR volumes were significantly different (P = .001);observer 2 CT and MR volumes were not significantly different (P = .079). CONCLUSIONS: With both CT and MR imaging, variation is less when evaluations are co nducted by one observer. Variation in one observer may be further redu ced by using MR imaging in place of CT.