|تعداد مشاهده مقاله||12,903,111|
|تعداد دریافت فایل اصل مقاله||6,147,725|
T1 Thermometry for Deep Brain Stimulation Applications: A Comparison between Rapid Gradient Echo Sequences
|Journal of Biomedical Physics and Engineering|
|مقالات آماده انتشار، اصلاح شده برای چاپ، انتشار آنلاین از تاریخ 19 اردیبهشت 1402 اصل مقاله (1.19 M)|
|نوع مقاله: Original Research|
|شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.2210-1546|
|Zinat Zarrini-Monfared1؛ Mansour Parvaresh2؛ Mehdi Mohammad Mirbagheri* 1، 3|
|1Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran|
|2Department of Neurosurgery, Hazrat Rasool Hospital, Iran University of Medical Sciences, Tehran, Iran|
|3Department of Physical Medicine and Rehabilitation, Northwestern University, USA|
|Background: T1 thermometry is considered a straight method for the safety monitoring of patients with deep brain stimulation (DBS) electrodes against radiofrequency-induced heating during Magnetic Resonance Imaging (MRI), requiring different sequences and methods. |
Objective: This study aimed to compare two T1 thermometry methods and two low specific absorption rate (SAR) imaging sequences in terms of the output image quality.
Material and Methods: In this experimental study, a gel phantom was prepared, resembling the brain tissue properties with a copper wire inside. Two types of rapid gradient echo sequences, namely radiofrequency-spoiled and balanced steady-state free precession (bSSFP) sequences, were used. T1 thermometry was performed by either T1-weighted images with a high SAR sequence to increase heating around the wire or T1 mapping methods.
Results: The balanced steady-state free precession (bSSFP) sequence provided higher image quality in terms of spatial resolution (1×1×1.5 mm3 compared with 1×1×3 mm3) at a shorter acquisition time. The susceptibility artifact was also less pronounced for the bSSFP sequence compared with the radiofrequency-spoiled sequence. A temperature increase, of up to 8 ℃, was estimated using a high SAR sequence. The estimated change in temperature was reduced when using the T1 mapping method.
Conclusion: Heating induced during MRI of implanted electrodes could be estimated using high-resolution T1 maps obtained from inversion recovery bSSFP sequence. Such a method gives a direct estimation of heating during the imaging sequence, which is highly desirable for safe MRI of DBS patients.
|Magnetic Resonance Imaging؛ Safety؛ Thermometry؛ Deep Brain Stimulation|
تعداد مشاهده مقاله: 88
تعداد دریافت فایل اصل مقاله: 94