Open AccessEVALUATION OF SPECIFIC ABSORPTION RATE AMONG PATIENTS USING 3 TESLA AND 1.5 TESLA MAGNETIC RESONANCE IMAGING MACHINES
Author(s) -
Supakajee Saengruang-Orn,
Busabong Noola
Publication year - 2020
Publication title -
journal of southeast asian medical research
Language(s) - English
Resource type - Journals
ISSN - 2697-5424
DOI - 10.55374/jseamed.v4i1.54
Subject(s) - specific absorption rate , magnetic resonance imaging , nuclear medicine , medicine , radiofrequency coil , radiology , computer science , telecommunications , antenna (radio)
Background: Specific Absorption Rate (SAR) is radiofrequency power delivered to tissue duringa Magnetic Resonance Imaging (MRI) examination, expressed as watts per kg (W/kg). Radiofrequencypower deposition results in increased heating of patient tissues; thus, the use of MRI has to becontrolled to ensure patient safety.
Objective: The study aimed to evaluate SAR among patients using the 3 Tesla MRI (MRI 3T) and 1.5Tesla MRI (MRI 1.5T) machines.
Methods: Data were obtained from patients who were examined using MRI 3T (1,159 patients, 8,225series) and MRI 1.5T (1,423 patients, 8,605 series) machines. Age, body weight, SAR, repetition time(TR), type of radiofrequency (RF) pulse and anatomical region exposed were studied.
Results: Average SAR for all patients using the MRI 3T was lower than that of the MR 1.5T in everypart (p 75 degrees, 0.77 W/Kg and 0.94W/Kg, accordingly (p < 0.001) similar to the MRI 1.5T.
Conclusion: The average SAR of patients evaluated using the MRI 3T was lower than those of patientsevaluated using the MRI 1.5T in every body part examined. SAR was lower when the TR was increasedand flip angle was decreased.