Abstract
Elongated conductors, such as pacemaker leads, can couple to the MRI radio-frequency (RF) field during MRI scan and cause dangerous tissue heating. By selecting proper RF exposure conditions, the RF-induced power deposition can be suppressed. As the RF-induced power deposition is a complex function of multiple clinical factors, the problem remains how to perform the exposure selection in a comprehensive and efficient way. The purpose of this work is to demonstrate an exposure optimization trail that allows a comprehensive optimization in an efficient and traceable manner. The proposed workflow is demonstrated with a generic 40 cm long cardio pacemaker, major components of the clinical factors are decoupled from the redundant data set using principle component analysis, the optimized exposure condition can not only reduce the in vivo power deposition but also maintain good image quality.
Highlights
Patients with implantable medical devices are usually excluded from the MRI examinations due to the very complicated electromagnetic (EM) environment patients are exposed to during MRI, including static, gradient, and radiofrequency (RF) magnetic fields
For patients with medical implants, the induced in vivo electrical field electrical field along with the implant routing (Etan) amounts to a multitude of variables specific to the MRI system [11, 12] (e.g., RF-coil design and manufacturing details), patient anatomy [13, 14], and imaging positions
To decouple the target implant routing from other routings, principle component analysis (PCA) procedure is performed on the six routing groups
Summary
Patients with implantable medical devices are usually excluded from the MRI examinations due to the very complicated electromagnetic (EM) environment patients are exposed to during MRI, including static, gradient, and radiofrequency (RF) magnetic fields. The exposure condition selected to reduce the RF-induced heating may at the same time decrease the MRI imaging quality dramatically [10]. It is important that the exposure condition are optimized so that the RF-induced heating are reduced and at the same time certain MRI imaging quality is reserved. For patients with medical implants, the induced in vivo electrical field Etan amounts to a multitude of variables specific to the MRI system [11, 12] (e.g., RF-coil design and manufacturing details), patient anatomy [13, 14], and imaging positions. The decoupled major clinical scenarios greatly reduce the data redundantly, enable a comprehensive and efficient exposure optimization resulting in both good imaging quality and patient safety
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