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Author profile
Seng Boh Gary Lim, PhD, MS
Department of Medical Physics, Memorial Sloan Kettering Cancer Center
A Novel 3D-Printing Process for a Tissue-Equivalent Phantom for Single-Isocenter Multi-Target Stereotactic Radiosurgery
The aims of this project were to (1) develop and apply a process to optimize 3D-printing processes specifically for tissue-equivalent small-field dosimetry phantoms and, (2) design and test a 3D-printed phantom for single-isocenter multi-target (SIMT) stereot...
Poster Program · Therapy Physics
A Universal TPS Beam Model for Varian Truebeam SRS Treatment out-Performs Local Center-Specific Beam Models
Treatment planning system (TPS) beam modelling is identified as the largest cause of independent dosimetry audit failure. This study aims to develop and validate a universal beam model (UBM) specific to single-iso multi-target (SIMT) stereotactic radiosurgery...
Poster Program · Therapy Physics
Beam Characterization and QA Recommendations for 2.5 MV Imaging Beams In a Large Institution Network
Current AAPM guidelines (TG-104 and MPPG 2.b) primarily address kV or standard MV portal beams for imaging and are not well suited for low-dose-rate 2.5 MV imaging beams, particularly in establishing dose and image quality baselines. This study developed and...
Poster Program · Therapy Physics
Can Enhanced-Couch MPC Replace Off-Isocenter Winston-Lutz QA?
To test the hypothesis that geometric metrics measured by the enhanced-couch Machine Performance Check (MPC) can serve as a surrogate to predict off-axis isocentricity failure.
Poster Program · Therapy Physics
Characterization of Free-Breathing Gated CBCT Imaging on C-Arm Linac with Hypersight
An improved imager and software (HyperSight on a Varian TrueBeam linac) feature a larger detector panel and increase the maximum gantry rotation speed for CBCT imaging to 1.5 revolutions per minute (rpm). While enabling faster acquisition, its impact on free-...
Poster Program · Therapy Physics
Commissioning and Initial Clinical Experience of Automated Breath-Hold Delivery on a 1.5 Tesla MR-Linac
Report commissioning and initial clinical experience using automated breath hold (BH) delivery with Elekta Unity’s Comprehensive Motion Management (CMM).
Poster Program · Therapy Physics
Feasibility of a High-Resolution CMOS 2D Detector Array As a Film Alternative for IMRT Commissioning
To evaluate a high-resolution CMOS 2D detector array (myQA SRS, IBA GmbH, Germany) as an efficient alternative to radiochromic films (RCF) for IMRT commissioning.
Poster Program · Therapy Physics
Pitfalls and Practical Protocol Optimization for Low-Pitch Spiral 4DCT Mode: Assessment of Static Image Quality In Terms of Noise, Artifacts, and Slice Sensitivity Profile
To assess how low-pitch spiral 4DCT impacts image quality, particularly noise, artifacts, and slice sensitivity profile (SSP), to help overcome the limitations of this technique.
Poster Program · Therapy Physics
AI-Based Psqa Prediction for Single-Isocenter Multiple-Target Radiosurgery
Single-isocenter multiple-target (SIMT) stereotactic radiosurgery (SRS) presents significant dosimetric challenges for patient-specific quality assurance (PSQA). Standard complexity metrics often fail to predict deliverability for these complex plans. This st...
Proffered Program · Therapy Physics
A Multi-Institutional Model for EPID-Based 3D Dose Reconstruction in a Virtual Spherical Phantom for Benchmarking and Remote Auditing of Stereotactic Radiosurgery
For single-isocenter multi-target (SIMT) stereotactic radiosurgery (SRS), benchmarking, auditing and inter-institutional standardization of dose delivery remains challenging as it requires specialized equipment and expertise. Electronic portal imaging devices...
Proffered Program · Therapy Physics