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Brain Imaging

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...

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SU-E-T-505: BrainLab Plan Comparisons: Brain Scan Pencil Beam versus IPlan Monte Carlo.

M Kowski¹, J Edwards¹, L Bauer¹

¹Cancer Centers of the Carolinas, Greenville, SC.

Medical Physics

|May 19, 2017

Summary

Monte Carlo (MC) dose modeling in BrainLab IPlan significantly differs from pencil beam (PB) calculations, impacting treatment plans. Thorough comparisons are crucial before implementing new treatment planning systems (TPS) to ensure patient safety and treatment efficacy.

Keywords:

Anatomy Brain Cancer Computer software Dosimetry Medical treatment planning Monte Carlo methods Radiation therapy Radiosurgery Therapeutics

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Area of Science:

Medical Physics
Radiation Oncology

Background:

The transition to new treatment planning systems (TPS) necessitates careful evaluation of dose calculation algorithms.
BrainLab's IPlan TPS introduces Monte Carlo (MC) dose modeling, replacing the older BrainScan system's pencil beam (PB) algorithm.

Purpose of the Study:

To quantitatively assess differences in dose calculations between MC and PB modeling in BrainLab's IPlan TPS.
To investigate potential impacts of these dose calculation changes on patient treatments and outcomes.

Main Methods:

Collected beam data for the BrainLab IPlan TPS according to manufacturer guidelines.
Compared treatment plans generated using PB modeling in both BrainScan and IPlan TPS.
Compared treatment plans generated using MC modeling in IPlan TPS against PB models.

Main Results:

Significant differences were observed in dose distribution, DVH values, and monitor units between MC and PB modeling.
These differences varied based on patient anatomy and tumor site.
Comparisons for Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT) will be presented.

Conclusions:

Clinical implementation of new TPS requires caution and adherence to AAPM guidelines.
Thorough comparisons between old and new dose calculation models are essential.
Independent end-to-end system checks using phantoms like the RPC phantom are recommended.