Signal-to-noise ratio has long been the standard for gauging the performance of MR scanners. Its calculation, however, can be tedious, especially when several scanners are involved.
Signal-to-noise ratio has long been the standard for gauging the performance of MR scanners. Its calculation, however, can be tedious, especially when several scanners are involved.
Medical physicists reported at the Society for Imaging Informatics in Medicine on Saturday that they have developed a semiautomated method for coming up with this measure, as well as a second measure, signal-difference-to-noise ratio.
Randell L. Kruger, Ph.D., a medical physicist at the Marshfield Clinic in Marshfield, WI, reported on the use of an interface definition language-based program developed at the clinic to automate SNR and SDNR measurements. It queries DICOM phantom files, shows DICOM header information, displays the first and seventh axial images, and then quantifies signal and noise in specific areas. Two regions of interest are examined when calculating SDNR. A single ROI is used when calculating SNR.
Kruger and colleagues used the program to assess the performance of 434 scanners made by GE, Philips, Toshiba, Siemens, Picker, Fonar, and Hitachi, breaking the equipment into groups from 0.2T to 0.7T and 1T to 2T. They used the same cylindrical QC phantom indicated for the ACR accreditation program for MR.
European Society of Breast Imaging Issues Updated Breast Cancer Screening Recommendations
April 24th 2024One of the recommendations from the European Society of Breast Imaging (EUSOBI) is annual breast MRI exams starting at 25 years of age for women deemed to be at high risk for breast cancer.
New Literature Review Assesses Merits of Cardiac MRI After Survival of Sudden Cardiac Arrest
April 19th 2024While noting inconsistencies with the diagnostic yield of cardiac MRI in patients who survived sudden cardiac arrest, researchers cited unique advantages in characterizing ischemic cardiomyopathy (ICM) and facilitating alternate diagnoses.
Study of Ofatumumab for Multiple Sclerosis Shows 'Profoundly Suppressed MRI Lesion Activity'
April 17th 2024The use of continuous ofatumumab in patients within three years of a relapsing multiple sclerosis diagnosis led to substantial reductions in associated lesions on brain MRI scans, according to research recently presented at the American Academy of Neurology (AAN) conference.