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The Results of the Survey about Present Situation of Quality Assurance for Radiotherapy Machine of Korea

Jeong S, Yoon M, Lee H

As radiation therapy is one of three major cancer treatment methods, many cancer patients get radiation therapy. Because of the invisible and scattering characteristics of radiation, it is impossible to...
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Determination of Beam Quality Correction Factors for the PTW-Markus Chamber for Electron Beam Qualities R50=1.0 and 1.4 g/cm2

Kim MY, Rhee DJ, Moon YM, Jeong DH

The Markus ionization chamber(R) is a small plane parallel ionization chamber widely used in clinical electron beam dosimetry. Plane parallel chambers were recommended for low energy electron dosimetry with the...
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Assessment for the Utility of Treatment Plan QA System according to Dosimetric Leaf Gap in Multileaf Collimator

Lee SS, Choi SH, Min CK, Kim WC, Ji YH, Park S, Jung H, Kim MS, Yoo HJ, Kim KB

For evaluating the treatment planning accurately, the quality assurance for treatment planning is recommended when patients were treated with IMRT which is complex and delicate. To realize this purpose, treatment...
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Dosimetric Evaluation of a Small Intraoral X-ray Tube for Dental Imaging

Ji Y, Kim Y, Lee R

Radiation exposure from medical diagnostic imaging procedures to patients is one of the most significant interests in diagnostic x-ray system. A miniature x-ray intraoral tube was developed for the first...
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Evaluation of Dosimetric Leaf Gap (DLG) at Different Depths for Dynamic IMRT

Chang KH, Kwak J, Cho B, Jeong C, Bae JB, Yoon SM, Lee SW

This study is to evaluate thedosiemtric leaf gap (DLG) at different depths for dynamic intensity-modulated radiation therapy (IMRT) in order to evaluate the absolute dose and dose distribution according to...
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Analysis on the Positional Accuracy of the Non-orthogonal Two-pair kV Imaging Systems for Real-time Tumor Tracking Using XCAT

Jeong H, Kim Y, Oh O, Lee S, Jeon H, Lee SW

In this study, we aim to design the architecture of the kV imaging system for tumor tracking in the dual-head gantry system and analyze its accuracy by simulations. We established...
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Outcomes after Reirradiation for Brain Metastases

Yu J, Choi JH, Ma SY, Jeung T

We retrospectively analyzed the outcomes in patients who underwent reirradiation for brain metastasis. Twenty-three patients with brain metastases who were initially treated with palliative brain radiotherapy and were retreated with...
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Dosimetric Evaluation of Amplitude-based Respiratory Gating for Delivery of Volumetric Modulated Arc Therapy

Lee CY, Kim WC, Kim HJ, Park JH, Min CK, Shin DO, Choi SH, Park S, Huh HD

The purpose of this study is to perform a dosimetric evaluation of amplitude-based respiratory gating for the delivery of volumetric modulated arc therapy (VMAT). We selected two types of breathing...
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Study of Motion-induced Dose Error Caused by Irregular Tumor Motion in Helical Tomotherapy

Cho MS, Kim TH, Kang SH, Kim DS, Kim KH, Cheon GS, Suh TS

The purpose of this study is to analyze motion-induced dose error generated by each tumor motion parameters of irregular tumor motion in helical tomotherapy. To understand the effect of the...
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