3.0T 자기공명영상에서 ACR 팬텀을 이용한 품질평가

Abstract

This study was purpose to evaluation of measurement of image quality according to Modulation Transfer Function (MTF) and noise power spectrum (NPS) using American college of radiology (ACR) phantom for 3.0T magnetic resonance imaging (MRI). MRI was used Vida 3.0T MRI 2020s and 2021s. Head and neck shim head coil were 20 channels receive MR coil. The MRI was used parameters of image sequence for ACR standard and general hospital. MTF value of the ACR standard T1, T2 image in 2020s Siemense equipment was frequency 0.32 mm-1 , 0.27 mm , when the MTF was 0.5. And MTF value of -1 the ACR standard T1, T2 image in 2021s Siemense equipment was frequency 0.36 mm-1 , 0.38 mm , when the MTF was 0.5. -1 MTF value of the ACR general hospital T1, T2 image in 2020s Siemense equipment was frequency 0.40 mm-1, 0.39 mm , -1 when the MTF was 0.5. And MTF value of the ACR general hospital T1, T2 image in 2021s Siemense equipment was frequency 0.36 mm-1 , 0.36 mm , when the MTF was 0.5. NPS highest value of the ACR standard T2 horizontal image in 2020s -1 Siemense equipment was 3.03711E-06 when the frequency was 0.5 mm and the NPS highest value of the ACR standard T2 -1 horizontal image in 2021s Siemense equipment was 9.75354E-07 when the frequency was 0.5 mm . MTF and NPS were used -1 little bit efficiently using a general standard sequence more than the hospital sequence method using the ACR phantom. Furthermore MTF and NPS was the quantitative quality assurance (QA) evaluation methods for resolution and image intensity uniformity characteristics was applied mutatis mutandis, and the results values of the physical imaging MTF and NPS of the 3.0T MRI and ACR phantom were presented.