Whole-Body Specific Absorption Rate Measurement Method Based on NIM Calorimetry
10.3969/j.issn.1005-5185.2025.06.004
- VernacularTitle:基于NIM量热法测量MRI设备全身比吸收率
- Author:
Zhengshan HUANG
1
;
Pu ZHANG
1
;
Peng ZHANG
1
;
Chengwei LI
1
;
Jie SUN
1
Author Information
1. 中国计量科学研究院医学计量中心,北京 100029
- Publication Type:Journal Article
- Keywords:
Magnetic resonance imaging;
Specific absorption rate;
Calorimetry;
Phantom;
Quality control
- From:
Chinese Journal of Medical Imaging
2025;33(6):589-594
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To explore the feasibility and practical value of using National Institute of Metrology(NIM)calorimetry method to measure whole-body specific absorption rate(SAR)values of in-service MRI equipment.Materials and Methods A NIM calorimetry device for measuring whole-body SAR values was developed,SAR values of different MRI devices were measured by NIM calorimetry,and compared with National Electrical Manufacturers Association(NEMA)calorimetry and pulse-energy method to verify the measurement accuracy and applicability of the NIM calorimetry method.Results The NIM calorimetry device developed in this study had reliable performance,and the experimental results indicated the difference in measurement results between NIM calorimetry(1.63 W/kg)and NEMA calorimetry(1.80 W/kg)was within 10%.The difference between the SAR measurement results of multiple MRI devices based on NIM calorimetry(0.46,0.93,0.61 W/kg)and the pulse energy method(0.42,0.89,0.56 W/kg)was within 10%.Conclusion The NIM calorimetry method in this study can accurately measure whole-body SAR values and has applicability.
