RATIONALE AND OBJECTIVES: The authors performed this study to document the deformations that occur between pretreatment magnetic resonance (MR) imaging and intraoperative MR imaging during brachytherapy. MATERIALS AND METHODS: MR images obtained at 1.5 and 0.5 T in 10 patients with prostate cancer were analyzed for changes in the shape and substructure of the prostate. Three-dimensional models of the prostate were obtained. The authors measured anteroposterior dimension; total gland, peripheral zone, and central gland volumes; transverse dimension; and superoinferior height. RESULTS: Gland deformations were seen at visual inspection of the three-dimensional models. The anteroposterior dimension of the total gland, central gland, and peripheral zone increased from 1.5- to 0.5-T imaging (median dimension, 4.9, 1.5, and 1.8 mm, respectively), and the increase was greatest in the peripheral zone (P < .05, all comparisons). There was a decrease in the transverse dimension from 1.5- to 0.5-T imaging (median, 4.5 mm; P < .005). The total gland volume and the superoinferior height did not show a statistically significant change. CONCLUSION: There were significant deformations in the shape of the prostate, especially in the peripheral zone, between the two imaging studies. The likely causes of the shape change are differences in rectal filling (endorectal coil used in 1.5-T studies vs obturator in 0.5-T studies) and/or changes in patient position (supine vs lithotomy). These findings suggest that pretreatment images alone may not be reliable for accurate therapy planning. It may be useful to integrate pre-and intraoperative data.
RATIONALE AND OBJECTIVES: The authors performed this study to document the deformations that occur between pretreatment magnetic resonance (MR) imaging and intraoperative MR imaging during brachytherapy. MATERIALS AND METHODS: MR images obtained at 1.5 and 0.5 T in 10 patients with prostate cancer were analyzed for changes in the shape and substructure of the prostate. Three-dimensional models of the prostate were obtained. The authors measured anteroposterior dimension; total gland, peripheral zone, and central gland volumes; transverse dimension; and superoinferior height. RESULTS: Gland deformations were seen at visual inspection of the three-dimensional models. The anteroposterior dimension of the total gland, central gland, and peripheral zone increased from 1.5- to 0.5-T imaging (median dimension, 4.9, 1.5, and 1.8 mm, respectively), and the increase was greatest in the peripheral zone (P < .05, all comparisons). There was a decrease in the transverse dimension from 1.5- to 0.5-T imaging (median, 4.5 mm; P < .005). The total gland volume and the superoinferior height did not show a statistically significant change. CONCLUSION: There were significant deformations in the shape of the prostate, especially in the peripheral zone, between the two imaging studies. The likely causes of the shape change are differences in rectal filling (endorectal coil used in 1.5-T studies vs obturator in 0.5-T studies) and/or changes in patient position (supine vs lithotomy). These findings suggest that pretreatment images alone may not be reliable for accurate therapy planning. It may be useful to integrate pre-and intraoperative data.
Authors: Petter Risholm; Andriy Fedorov; Jennifer Pursley; Kemal Tuncali; Robert Cormack; William M Wells Journal: Proc IEEE Int Symp Biomed Imaging Date: 2011-06-09
Authors: Li Hong Chen; Henry Ho; Richie Lazaro; Choon Hua Thng; John Yuen; Wan Sing Ng; Chris Cheng Journal: Int J Comput Assist Radiol Surg Date: 2010-02-24 Impact factor: 2.924
Authors: Zarine K Shah; Saba N Elias; Ronney Abaza; Debra L Zynger; Lawrence A DeRenne; Michael V Knopp; Beibei Guo; Ryan Schurr; Steven B Heymsfield; Guang Jia Journal: Acad Radiol Date: 2015-01-08 Impact factor: 3.173
Authors: Helen Xu; Andras Lasso; Peter Guion; Axel Krieger; Aradhana Kaushal; Anurag K Singh; Peter A Pinto; Jonathan Coleman; Robert L Grubb; Jean-Baptiste Lattouf; Cynthia Menard; Louis L Whitcomb; Gabor Fichtinger Journal: Int J Comput Assist Radiol Surg Date: 2013-03-27 Impact factor: 2.924
Authors: Sota Oguro; Junichi Tokuda; Haytham Elhawary; Steven Haker; Ron Kikinis; Clare M C Tempany; Nobuhiko Hata Journal: J Magn Reson Imaging Date: 2009-11 Impact factor: 4.813
Authors: Jennifer Pursley; Petter Risholm; Andriy Fedorov; Kemal Tuncali; Fiona M Fennessy; William M Wells; Clare M Tempany; Robert A Cormack Journal: Med Phys Date: 2012-11 Impact factor: 4.071