การประเมนคณภาพของภาพจากการใชขดลวดวทย 3 ชนด: การศกษาดวยหนจำลองเอซอาร-เอมอารไอ

Background and Objective: Diagnosis from Magnetic Resonance Imaging (MRI) requires radiofrequency coils to transmit and receive data signals for processing and reconstructing on MR image. There are many radiofrequency (RF) coils used for different organs such as head coil, body coil, and anterior surface coil. The objective of this study was to evaluate the qualities of images using three different radiofrequency coils following to the standard quality control provided by Department of Medical Sciences, Ministry of Public Health. Methods: The ACR phantom was acquired T1 weighted image by using three RF coils following the scanning instructions of Department of Medical Sciences, Ministry of Public Health. Eight MRI system performances were tested to estimate the image quality. In this study, the data collection was performed during May to October 2016. Results: The results showed that the quality of image using head coil passed all eight system performance evaluations. While the image quality from body coil and anterior surface coil passed 6 and 5 of 8 tests of ACR criteria in head coil, respectively. Conclusion: Different types of RF coils are used in MRI systems. Each of RF coil has advantages and disadvantages for various purposes. The ACR MRI phantom is designed to use with a head coil. This study found the ACR tested method can be applied to evaluate the image quality of other RF coils, but not every parameter. The evaluation of image quality can be used as a regular monitoring which provides the detection of changes in performance of the MR images before they can adversely affect clinical images.