The Investigation of Correlation between physiological Parameters and Heat Accumulation during Magnetic Resonance Imaging
| Autor: | Shih-Mei Hsu, 徐世美 |
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| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In the past several decades, the non-invasive and radiation free Magnetic Resonance Imaging (MRI) already played a very important role in medical imaging. It is a relatively safer method; however some of the security considerations are often neglected, such as the interaction between Radio Frequency (RF) and human body that may induces tissue heating during MRI examination. Some of the examinees feel hot and sweat during the examination which not only causes them uncomfortable but also interrupts the examination due to their restless movement, resulting in unfinished examinations as scheduled. Generally, the obese people with higher body mass index (BMI) are considered more likely to sweat. But, from our experience, people with same shape under same examination conditions usually have different heat accumulation ability. In addition, some of the literatures also indicated the connection existence between basal metabolic rate (BMR) and sweat and biological thermal conductivity. Therefore, a Siemens 1.5 T MR imager was utilized to examine 227 patients (132 male and 95 female, more than 20 years old) who required lumbar spine MR images. The purpose of this study is to evaluate the body temperature increase and sweating response during MRI examination with the physiological parameters. Our research procedures including: body temperature measurement, gender and age recoding before MR examination, the data were then subjected into calculation based on BMR and BMI equations. After MR examination, the body temperature were measured again for temperature rising calculation, sweating level were also evaluated, and the questionnaire containing hot feeling etc. were collected. Finally, the outcomes were further assayed by SPSS 12.0 statistical analysis. Our results showed that BMR and heat accumulation ability had significant relationship (p < 0.05) in both men and women. After calculation, the BMR threshold is 1511 kcal for male and 1315 kcal for female. We also investigated the correlation between heats accumulating level with body fat ratio; however, there is no correlation existed. In conclusion, BMR value could serve as a valuable evaluation parameter before MRI examination and could be provided for radiologists to adjust examination condition in the future. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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