Open AccessThe effect of quality control on the function of magnetic resonance imaging (MRI), using American College of Radiology (ACR) phantom
Author(s) -
H.M. Etman,
Ahmed Mokhtar,
Maysa I. Abdel-Hamid,
Marwa A. Ahmed,
Tarek El-Diasty
Publication year - 2017
Publication title -
the egyptian journal of radiology and nuclear medicine /the egyptian journal of radiology and nuclear medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.19
H-Index - 13
eISSN - 2090-4762
pISSN - 0378-603X
DOI - 10.1016/j.ejrnm.2016.12.003
Subject(s) - imaging phantom , medicine , magnetic resonance imaging , quality (philosophy) , medical physics , nuclear medicine , radiology , physics , quantum mechanics
Objective: To study image quality of MRI scanner using the American College of Radiology (ACR) phantom.Material and methods: Image quality of 1.5 T MRI scanner was tested using ACR phantom. A standard head coil with standard restraints was used to fix the phantom head position. The phantom included seven modules for measuring MRI scanner image quality. MRI images for each module were analyzed.Results: For the Geometric accuracy test the inside length of the phantom was 146 mm and the inside diameter was 189.4 mm. For the High-contrast spatial resolution, individual small bright spots on the image were three pairs of hole arrays and were distinguishable. For the slice thickness test, the top signal ramp length was 54.4 mm and bottom signal ramp length was 54.8 mm so the slice thickness was 5.46 mm. For the slice position accuracy, the bar length differences of intensity uniformity a value, called percent integral uniformity (PIU), was 96.15%. For the percent-signal ghosting, ghosting ratio was 0.0002. For the low contrast object detectability, the sum of numbers of complete spokes scored was 30 spokes.Conclusions: Image quality tests were very important in acceptance of any MRI scanner after installation and during maintenance. Using ACR phantom, these tests approve that the image parameters are acceptable