Jessica A. Martinez1 and Daniel B. Ennis1,2,3
1Department of Radiology, Stanford University, Stanford, CA, United States, 2Cardiovascular Institute, Stanford University, Stanford, CA, United States, 3Maternal & Child Health Research Institute, Stanford University, Stanford, CA, United States
1Department of Radiology, Stanford University, Stanford, CA, United States, 2Cardiovascular Institute, Stanford University, Stanford, CA, United States, 3Maternal & Child Health Research Institute, Stanford University, Stanford, CA, United States
Lead-tip local-SAR for thoracic pediatric with CIEDs MRI exams can be substantially reduced using a supine, feet-first orientation. If the exam must be performed in a supine head-first, a leftward transversal displacement, lateral rotation, or Fowler position may mitigate local-SAR.
Figure 2. (A) SAR maps and 1-gram local-SAR values for RA and RV leads for the reference position (supine and head-first). (B) SAR maps and 1-gram local-SAR values for a feet-first patient orientation is substantially reduced. (C) Right-left lateral rotations also substantially reduce the 1-gram local-SAR.
Figure 1. Patient position and orientation variations: (A) head-first vs. feet-first; (B) lateral rotation; (C) transverse left-right displacement; and (D) Fowler position. Each was compared to the local-SAR value with respect to a reference position (shaded, supine and head-first) for a thoracic exam.
