Weekly MRI Equipment Quality Control for Large ACR Phantom
Quality control (QC) of the human MRI scanners is essential to ensure optimalimage acquisition. In order to acieve this purpose, our center performs the phantom QC test weekly according to the American College of Radiology (ACR) MRI accreditation procedure. Several important assessments of MR image quality are included as follows: geometric accuracy, high-contrast resolution, slice thickness accuracy, slice position accuracy, image intensity uniformity, percent signal ghosting, and low-contrast object detectability. In addition, signal-to-noise ratio and central frequency are monitored as well. Users are welcome/encouraged to check the QC results of the scanner before performing his/her studies.
ACR large QC phantom |
Total 11 axial images are used to assess MRI quality. |
MRI Facility Name: FIBRE Siemen Prisma 3.0 T
Current Status: PASS
ACR MRI QC Scan Parameters
Study | Sagittal Locator | Axial T1 | Axial T2 double-echo | |
Pulse sequence | Spin echo | Spin echo | Spin echo | |
TR (ms) | 200 | 500 | 2000 | |
TE (ms) | 20 | 20 | 20/80 | |
FOV (cm) | 25 | 25 | 25 | |
Slices | 1 | 11 | 11 | |
Slice thinkness(gap) (mm) | 20(-) | 5(5) | 5(5) | |
NEX | 1 | 1 | 1 | |
Matrix | 256×256 | 256×256 | 256×256 | |
Acquision time (min:sec) | 0:56 | 2:16 | 8:56 |
Localizer image
Geometric distortion measurement:
Example images acquired using ACR T1 protocol:
Artifact Evaluation:
Example images acquired using ACR T2 protocol
Artifact Evaluation:
Weekly QC Results:
Date | Table Position | Center Freq (MHz) | TX Gain (V) | Geometric Accuracy Measurements (Ax. Slice #5 Diameter) | High-Contrast Spatial Resolution (Slice 1-Highest Resolved) | Low-Contrast Detectability | Artifact Evaluation | Tested By | Note | ||||
26-Jun-2023 | 123.257258 | 217.6 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
01-Jun-2023 | 123.257393 | 217.6 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
24-Apr-2023 | 123.257399 | 217.9 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
20-Mar-2023 | 123.257499 | 215.7 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
16-Feb-2023 | 123.257610 | 215.4 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
08-Feb-2023 | 123.257416 | 218.5 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
01-Feb-2023 | 123.257326 | 218.1 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
25-Jan-2023 | 123.257328 | 218.2 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A | |||||
12-Jan-2023 | 123.257330 | 217.3 | T1: Pass; T2: Pass | T1 UL: Pass; T1 LR: Pass; T2 UL: Pass; T2 LR: Pass | T1: Pass; T2: Pass | None | R. Tain | N/A |