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• W2149976266 abstract "Rigidly-fixed head frames are frequently used for immobilization during single fraction SRS. Biologic imaging sequences to describe the natural history of intracranial disease have been limited to frameless MRI acquisitions due to concern for potential artifacts and MRI-induced thermal injury. We describe an optimized SRS DWI technique that reduces head frame-associated susceptibility artifact/distortion and has RF-induced heating within safe limits. Phantoms (melon, skull, and grid) attached to a Model-G, insulated post, SRS head frame were used to characterize spatial, heating, and metal susceptibility artifacts during SRS image acquisition using a 3T clinical MRI scanner. MRI-induced heating was evaluated using fiberoptic temperature probes placed at the head frame screw-melon interface and at sub-surface depth (5 mm from the head frame screw tip) to serially measure the time-temperature profile during the reference (T1, SPGR, etc) & DWI sequences in an axial & oblique orientation. The Bio-Heat transfer equation was used to analyze absorbed power density (watts/cmˆ3) associated with each sequence. Resistivity of each current loop was assessed using an Ohmmeter‎. Geometric distortion with single-shot vs. multi-shot (DWI-FSE (Propeller MRI)) EPI acquisition methods were evaluated by estimating differences (mm) in X, Y, & Z coordinates describing localization within the grid & skull phantom. The mean change in temperature at the pin/melon interface at depth for the T1, SPGR, FRFSE were 1.36, 0.08, & 0.17 oC vs. 0.22 & 1.28 oC for the DWI & Propeller-FSE respectively. This change in temperature corresponded to an initial heat transfer estimated at 0.156-0.193 Watts/cmˆ3 for the T1, 0.15-0.182 Watts/cmˆ3 for the Propeller-FSE, and an negligible estimate (5 - 10x less) for the SPGR, FRFSE, and DWI. Single shot EPI DWI showed substantial susceptibility artifact in the presence of the SRS head frame while the Propeller-FSE sequence displayed only minimal distortion within 1-1.5cm of the pin-skin interface. Measured brain shift was minimal using the DWI-Propeller FSE sequence with a max X, Y, & Z translation of 1.45, 0.88, & 1.08 mm relative to the max X, Y, & Z translation of 1.21, 0.92, & 0.96 mm with standard DWI. Geometric distortion was similar to the reference T1 (X: 0.85, Y: 0.5, Z: 1.68). DWI-PROPELLER-FSE reduced geometric distortion and had acceptable heating tolerances comparable to standard T1 imaging. Safety of the above sequences is contingent upon the use of insulated pin-head frames. Addition of DWI weighted imaging may improve volume delineation during head frame immobilized single fraction SRS." @default.
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• W2149976266 date "2014-09-01" @default.
• W2149976266 modified "2023-09-26" @default.
• W2149976266 title "Safety Assessment, Artifact Reduction, and Description of Geometric Distortion Associated With Diffusion Imaging (DWI) With Rigid Head Frame Immobilization for Stereotactic Radiosurgery" @default.
• W2149976266 doi "https://doi.org/10.1016/j.ijrobp.2014.05.2567" @default.
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