Journal of Advances in Developmental Research

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MLC Transmission and Dosimetric Leaf Gap (DLG) Measurement

Author(s) Priya Jacob
Country United States
Abstract The Dosimetric Leaf Gap (DLG) is a critical parameter in radiation therapy, particularly for treatment delivery systems utilizing multileaf collimators (MLCs). DLG represents the offset between the projected light field and the actual radiation field, influencing the accuracy of dose calculations in advanced radiotherapy techniques such as Intensity-Modulated Radiation Therapy (IMRT) and Volumetric-Modulated Arc Therapy (VMAT). Accurate modeling of the DLG, along with MLC transmission, is essential for achieving precise dose distribution during treatment planning and delivery. Both parameters play a significant role in characterizing the impact of the rounded leaf ends of MLCs within the Eclipse treatment planning system (TPS)9. This study presents a systematic and reliable method for determining the DLG using the cross-field dose width and ionization chamber measurements. By implementing this approach, we aim to enhance the accuracy of dose modeling6 in the TPS, ultimately improving treatment precision and patient safety in radiotherapy applications.
Keywords Dosimetric leaf gap(DLG), MLC, Treatment planning systems, GAFCHROMIC film, Multileaf collimator, MRT, VMAT, Radiation therapy, Dose calculation, Eclipse TPS, Ionization chamber, Beam quality, MLC transmission, Radiotherapy commissioning
Field Medical / Pharmacy
Published In Volume 13, Issue 2, July-December 2022
Published On 2022-11-04
Cite This MLC Transmission and Dosimetric Leaf Gap (DLG) Measurement - Priya Jacob - IJAIDR Volume 13, Issue 2, July-December 2022. DOI 10.5281/zenodo.15050090
DOI https://doi.org/10.5281/zenodo.15050090
Short DOI https://doi.org/g88zj8
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