Referenceless MR thermometry-a comparison of five methods

	Referenceless MR thermometry-a comparison of five methods
	Zou, Chao; Tie, Changjun; Pan, Min; Wan, Qian; Liang, Changhong; Liu, Xin; Chung, Yiu-Cho
刊名	PHYSICS IN MEDICINE AND BIOLOGY
	2017
文献子类	期刊论文
英文摘要	Proton resonance frequency shift (PRFS) MR thermometry is commonly used to measure temperature in thermotherapy. The method requires a baseline tem-perature map and is therefore motion sensitive. Several referenceless MR thermometry methods were proposed to address this problem but their performances have never been compared. This study compared the performance of five referenceless methods through simulation, heating of ex vivo tissues and in vivo imaging of the brain and liver of healthy volunteers. Mean, standard deviation, root mean square, 2/98 percentiles of error were used as performance metrics. Probability density functions (PDF) of the error distribution for these methods in the different tests were also compared. The results showed that the phase gradient method (PG) exhibited largest error in all scenarios. The original method (ORG) and the complex field estimation method (CFE) had similar performance in all experiments. The phase finite difference method (PFD) and the near harmonic method (NH) were better than other methods, especially in the lower signal-to-noise ratio (SNR) and fast changing field cases. Except for PG, the PDFs of each method were very similar among the different experiments. Since phase unwrapping in ORG and NH is computationally demanding and subject to image SNR, PFD and CFE would be good choices as they do not need phase unwrapping. The results here would facilitate the choice of appropriate referenceless methods in various MR thermometry applications.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/12041]
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	Zou, Chao,Tie, Changjun,Pan, Min,et al. Referenceless MR thermometry-a comparison of five methods[J]. PHYSICS IN MEDICINE AND BIOLOGY,2017.
APA	Zou, Chao.,Tie, Changjun.,Pan, Min.,Wan, Qian.,Liang, Changhong.,...&Chung, Yiu-Cho.(2017).Referenceless MR thermometry-a comparison of five methods.PHYSICS IN MEDICINE AND BIOLOGY.
MLA	Zou, Chao,et al."Referenceless MR thermometry-a comparison of five methods".PHYSICS IN MEDICINE AND BIOLOGY (2017).