PURPOSE: To clinically assess a previously described method (Rieke et.al., Magn Reson Med 2004) to produce more motion-robust MRI-based temperature images using data acquired during MRI-guided focused ultrasound surgery (MRgFUS) of uterine fibroids. MATERIALS AND METHODS: The method ("referenceless thermometry") uses surface fitting in nonheated regions of individual phase images to extrapolate and then remove background phase variations that are unrelated to temperature changes. We tested this method using images from 100 sonications selected from 33 patient MRgFUS treatments. Temperature measurements and thermal dose contours estimated with the referenceless method were compared with those produced with the standard phase-difference technique. Fitting accuracy and noise level were also measured. RESULTS: In 92/100 sonications, the difference between the two measurements was less than 3 degrees C. The average difference in the measurements was 1.5 +/- 1.4 degrees C. Small motion artifacts were observed in the phase-difference imaging when the difference was greater than 3 degrees C. The method failed in two cases. The mean absolute error in the surface fit in baseline images corresponded to a temperature error of 0.8 +/- 1.4 degrees C. The noise level was approximately 40% lower than the phase-difference method. Thermal dose contours calculated from the two methods agreed well on average. CONCLUSION: Based on the small error when compared with the standard technique, this method appears to be adequate for temperature monitoring of MRgFUS in uterine fibroids and may prove useful for monitoring temperature changes in moving organs. (c) 2008 Wiley-Liss, Inc.
PURPOSE: To clinically assess a previously described method (Rieke et.al., Magn Reson Med 2004) to produce more motion-robust MRI-based temperature images using data acquired during MRI-guided focused ultrasound surgery (MRgFUS) of uterine fibroids. MATERIALS AND METHODS: The method ("referenceless thermometry") uses surface fitting in nonheated regions of individual phase images to extrapolate and then remove background phase variations that are unrelated to temperature changes. We tested this method using images from 100 sonications selected from 33 patient MRgFUS treatments. Temperature measurements and thermal dose contours estimated with the referenceless method were compared with those produced with the standard phase-difference technique. Fitting accuracy and noise level were also measured. RESULTS: In 92/100 sonications, the difference between the two measurements was less than 3 degrees C. The average difference in the measurements was 1.5 +/- 1.4 degrees C. Small motion artifacts were observed in the phase-difference imaging when the difference was greater than 3 degrees C. The method failed in two cases. The mean absolute error in the surface fit in baseline images corresponded to a temperature error of 0.8 +/- 1.4 degrees C. The noise level was approximately 40% lower than the phase-difference method. Thermal dose contours calculated from the two methods agreed well on average. CONCLUSION: Based on the small error when compared with the standard technique, this method appears to be adequate for temperature monitoring of MRgFUS in uterine fibroids and may prove useful for monitoring temperature changes in moving organs. (c) 2008 Wiley-Liss, Inc.
Authors: J A de Zwart; F C Vimeux; J Palussière; R Salomir; B Quesson; C Delalande; C T Moonen Journal: Magn Reson Med Date: 2001-01 Impact factor: 4.668
Authors: Clare M C Tempany; Elizabeth A Stewart; Nathan McDannold; Bradley J Quade; Ferenc A Jolesz; Kullervo Hynynen Journal: Radiology Date: 2003-03 Impact factor: 11.105
Authors: William A Grissom; Viola Rieke; Andrew B Holbrook; Yoav Medan; Michael Lustig; Juan Santos; Michael V McConnell; Kim Butts Pauly Journal: Med Phys Date: 2010-09 Impact factor: 4.071
Authors: Viola Rieke; Adam M Kinsey; Anthony B Ross; William H Nau; Chris J Diederich; Graham Sommer; Kim Butts Pauly Journal: IEEE Trans Med Imaging Date: 2007-06 Impact factor: 10.048
Authors: David Schlesinger; Stanley Benedict; Chris Diederich; Wladyslaw Gedroyc; Alexander Klibanov; James Larner Journal: Med Phys Date: 2013-08 Impact factor: 4.071
Authors: Elizabeth R Jenista; Gigi Galiana; Rosa T Branca; Pavel S Yarmolenko; Ashley M Stokes; Mark W Dewhirst; Warren S Warren Journal: J Magn Reson Date: 2010-02-25 Impact factor: 2.229
Authors: Le Zhang; Alex Burant; Andrew McCallister; Victor Zhao; Karl M Koshlap; Simone Degan; Michael Antonacci; Rosa Tamara Branca Journal: Magn Reson Med Date: 2016-10-19 Impact factor: 4.668