The effects of spatial sampling choices on MR temperature measurements.
The effects of spatial sampling choices on MR temperature measurements.
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DOI：
10.1002/mrm.22636
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发表时间：
2011-02
影响因子：
3.3
通讯作者：
Parker, Dennis L.
中科院分区：
文献类型：
--
作者：
Todd, Nick;Vyas, Urvi;de Bever, Josh;Payne, Allison;Parker, Dennis L.
关键词：
The purpose of this paper is to quantify the effects that spatial sampling parameters have on the accuracy of MR temperature measurements during high intensity focused ultrasound (HIFU) treatments. Spatial resolution and position of the sampling grid were considered using experimental and simulated data for two different types of HIFU heating trajectories (a single point and a 4 mm circle) with maximum measured temperature and thermal dose volume as the metrics. It is demonstrated that measurement accuracy is related to the curvature of the temperature distribution, where regions with larger spatial second derivatives require higher resolution. The location of the sampling grid relative temperature distribution has a significant effect on the measured values. When imaging at 1.0 × 1.0 × 3.0 mm resolution, the measured values for maximum temperature and volume dosed to 240 CEM or greater varied by 17% and 33% respectively for the single point heating case, and by 5% and 18% respectively for the 4 mm circle heating case. Accurate measurement of the maximum temperature required imaging at 1.0 × 1.0 × 3.0 mm resolution for the single point heating case and 2.0 × 2.0 × 5.0 mm resolution for the 4 mm circle heating case.
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DOI：
10.1002/jmri.1880050306
发表时间：
1995-05-01
期刊：
JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING
影响因子：
--
作者：
HYNYNEN, K;DAMIANOU, CA;JOLESZ, FA
通讯作者：
JOLESZ, FA
影响因子：
4.4
作者：
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通讯作者：
Plewes, DB
影响因子：
3.5
作者：
Arora, D;Cooley, D;Roemer, RB
通讯作者：
Roemer, RB
影响因子：
3.3
作者：
Alexander, AL;Hasan, KM;Parker, DL
通讯作者：
Parker, DL
影响因子：
4.4
作者：
Salomir, R;Palussière, J;Moonen, CTW
通讯作者：
Moonen, CTW