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- W2973608420 abstract "This study investigates the validity of monitoring nose movement, using an infrared stereoscopic camera system (HDMM), to evaluate intracranial movement during treatment with the Icon™-model Gamma Knife®.The HDMM was validated by comparison against known displacements. Next, an anthropomorphic phantom was rotated to register nose displacements on the HDMM, which were compared to the displacements of seven intracranial locations determined by cone-beam CT (CBCT). Similarly, CBCT-calculated intracranial displacements were compared against HDMM-reported nose displacements for patients.HDMM-indicated displacements were accurate within 0.06mm mean. In the phantom, CBCT-calculated nose displacements agreed within 0.05mm (mean) of HDMM-reported nose displacements. In 16 instances intracranial displacements exceeded nose displacements; at the most extreme by 73% (2.76mm versus 1.59mm). Overall, intracranial anatomy displaced by 43% (mean) less than the nose. Patient data included no intracranial target displacements exceeding nose displacements.Intracranial phantom and patient anatomy displaced by approximately half that of the nose, suggesting nose movement is generally a suitable surrogate for intracranial movement. The study constitutes the presentation of a simple, robust method that can be applied to determine the relationship between nose tip and intracranial motion in real patients undergoing frameless treatments on Icon™." @default.
- W2973608420 created "2019-09-26" @default.
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- W2973608420 date "2017-01-01" @default.
- W2973608420 modified "2023-09-23" @default.
- W2973608420 title "Validity of the use of nose tip motion as a surrogate for intracranial motion in mask-fixated frameless Gamma Knife® Icon™ therapy." @default.
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