A fast referenceless PRFS-based MR thermometry by phase finite difference

	A fast referenceless PRFS-based MR thermometry by phase finite difference
	Chao Zou; Huan Shen; Mengyue He; Changjun Tie; Yiu-Cho Chung; Xin Liu
刊名	PHYSICS IN MEDICINE AND BIOLOGY
	2013
英文摘要	Proton resonance frequency shift-based MR thermometry is a promising temperature monitoring approach for thermotherapy but its accuracy is vulnerable to inter-scan motion. Model-based referenceless thermometry has been proposed to address this problem but phase unwrapping is usually needed before the model fitting process. In this paper, a referenceless MR thermometry method using phase finite difference that avoids the time consuming phase unwrapping procedure is proposed. Unlike the previously proposed phase gradient technique, the use of finite difference in the new method reduces the fitting error resulting from the ringing artifacts associated with phase discontinuity in the calculation of the phase gradient image. The new method takes into account the values at the perimeter of the region of interest because of their direct relevance to the extrapolated baseline phase of the region of interest ( where temperature increase takes place). In simulation study, in vivo and ex vivo experiments, the new method has a root-mean-square temperature error of 0.35 degrees C, 1.02 degrees C and 1.73 degrees C compared to 0.83 degrees C, 2.81 degrees C, and 3.76 degrees C from the phase gradient method, respectively. The method also demonstrated a slightly higher, albeit small, temperature accuracy than the original referenceless MR thermometry method. The proposed method is computationally efficient (similar to 0.1 s per image), making it very suitable for the real time temperature monitoring.
收录类别	SCI
原文出处	http://iopscience.iop.org/0031-9155/58/16/5735
语种	英语
WOS记录号	WOS:000322775300026
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/4756]
专题	深圳先进技术研究院_医工所
作者单位	PHYSICS IN MEDICINE AND BIOLOGY
推荐引用方式 GB/T 7714	Chao Zou,Huan Shen,Mengyue He,et al. A fast referenceless PRFS-based MR thermometry by phase finite difference[J]. PHYSICS IN MEDICINE AND BIOLOGY,2013.
APA	Chao Zou,Huan Shen,Mengyue He,Changjun Tie,Yiu-Cho Chung,&Xin Liu.(2013).A fast referenceless PRFS-based MR thermometry by phase finite difference.PHYSICS IN MEDICINE AND BIOLOGY.
MLA	Chao Zou,et al."A fast referenceless PRFS-based MR thermometry by phase finite difference".PHYSICS IN MEDICINE AND BIOLOGY (2013).