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Segmental Analysis Trial of Volumetric Modulated Arc Therapy for Quality Assurance of Linear Accelerator

Rahman MM, Kim CH, Huh HD, Kim S

PURPOSE: Segmental analysis of volumetric modulated arc therapy (VMAT) is not clinically used for compositional error source evaluation. Instead, dose verification is routinely used for plan-specific quality assurance (QA). While...
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Dose Estimation Curves Following In Vitro X-ray Irradiation Using Blood From Four Healthy Korean Individuals

Jang MA, Han EA, Lee JK, Cho KH, Shin HB, Lee YK

Cytogenetic dosimetry is useful for evaluating the absorbed dose of ionizing radiation based on analysis of radiation-induced chromosomal aberrations. We created two types of in vitro dose-response calibration curves for...
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Efficient Verification of X-ray Target Replacement for the C-series High Energy Linear Accelerator

Cho JD, Chun M, Son J, An HJ, Yoon J, Choi CH, Kim JI, Park JM, Kim JS

The manufacturer of a linear accelerator (LINAC) has reported that the target melting phenomenon could be caused by a non-recommended output setting and the excessive use of monitor unit (MU)...
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Verification of Mechanical Leaf Gap Error and VMAT Dose Distribution on Varian VitalBeamâ„¢ Linear Accelerator

Kim MS, Choi CH, An HJ, Son JM, Park SY

The proper position of a multi-leaf collimator (MLC) is essential for the quality of intensity-modulated radiation therapy (IMRT) and volumetric modulated arc radiotherapy (VMAT) dose delivery. Task Group (TG) 142...
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Guideline on Acceptance Test and Commissioning of High-Precision External Radiation Therapy Equipment

Kim J, Shin DO, Choi SH, Min S, Kwon N, Jung U, Kim DW

The complex dose distribution and dose transfer characteristics of intensity-modulated radiotherapy increase the importance of precise beam data measurement and review in the acceptance inspection and preparation stages. In this...
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Feasibility Study of Patient Specific Quality Assurance Using Transit Dosimetry Based on Measurement with an Electronic Portal Imaging Device

Baek TS, Chung EJ, Son J, Yoon M

This study was designed to measure transit dose with an electronic portal imaging device (EPID) in eight patients treated with intensity modulated radiotherapy (IMRT), and to verify the accuracy of...
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Electron Energy Distribution for a Research Electron LINAC

Lim H, Lee M, Yi J, Kang SK, Kim MY, Jeong DH

The energy distribution was calculated for an electron beam from an electron linear accelerator developed for medical applications using computational methods. The depth dose data for monoenergetic electrons from 0.1...
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Assessment of Radiation Dose from Radioactive Wedge Filters during High-Energy X-Ray Therapy

Back GM, Park SH, Kim TH

This paper evaluated the amount of radiation generated by wedge filters during radiation therapy using a high-energy linear accelerator, and the dose to the worker during wedge replacement. After 10-MV...
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Systematic Analysis of Clinical Outcomes Following Stereotactic Radiosurgery for Central Neurocytoma

Bui TT, Lagman C, Chung LK, Tenn S, Lee P, Chin RK, Kaprealian T, Yang I

Central neurocytoma (CN) typically presents as an intraventricular mass causing obstructive hydrocephalus. The first line of treatment is surgical resection with adjuvant conventional radiotherapy. Stereotactic radiosurgery (SRS) was proposed as...
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Evaluations and Comparisons of Body Surface Doses during Breast Cancer Treatment by Tomotherapy and LINAC Radiotherapy Devices

Lee HJ, Bae SH, Cho KH, Jeong JH, Kwon SI, Lee KD

Effects on skin caused by the dose from linear accelerator (LINAC) opposing portal irradiation and TomoDirect 3-D modeling treatment according to the radiation devices and treatment methods were measured, and...
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Analysis of Physical Properties for Various Compositions of Reusable LMG and LCV Micelle Gel

Kang JM, Lee DH, Cho YR, Hwang SB, Ji YH, Ahn SH, Keum KC, Lee RN, Cho SJ, Noh I

In this study, we evaluated the reusable leuco malachite green (LMG) micelle gel properties dependent on various components of chemical concentration and compared with leuco crystal violet (LCV). The gels...
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A case report of a patient with squamous cell carcinoma of the face irradiated using a stereotactic technique

Pontoriero A, Iati G, Pergolizzi S

External beam radiotherapy can be used to treat cutaneous squamous cell carcinomas (SCC). Acute skin toxicity is the most common adverse event. In this case study we report on an...
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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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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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Measurement of Electron Beam Output for the Prototype Compact Linac

Kim SW, Kang SK, Rhee DJ, Lim H, Lee M, Yi J, Lee M, Yang K, Ro TI, Jeong DH

The C-band compact linear accelerator (linac) is being developed at Dongnam Institute of radiological & Medical Sciences (DIRAMS) for medical and industrial applications. This paper was focused on the output...
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New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom

Shandiz MH, Layen GS, Anvari K, Khalilzadeh M

PURPOSE: In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. MATERIALS AND METHODS: The QA protocols,...
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Suggestion for Comprehensive Quality Assurance of Medical Linear Accelerator in Korea

Choi SH, Park DW, Kim KB, Kim DW, Lee J, Shin DO

American Association of Physicists in Medicine (AAPM) Published Task Group 40 report which includes recommendations for comprehensive quality assurance (QA) for medical linear accelerator in 1994 and TG-142 report for...
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Evaluation of Dosimetric Characteristics of a Double-focused Dynamic Micro-Multileaf Collimator (DMLC)

Kim AR, Seo JH, Shin HJ, Park HW, Lee KW, Lee JC, Kim SW, Kim JN, Park H, Lee HK, Kang YN

Double-focused micro-Multileaf Collimator (microMLC) is able to create radiation fields having sharper dose gradients at the field edges than common MLC. Therefore, microMLC has been used for the stereotactic radio-surgery...
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The first private-hospital based proton therapy center in Korea; status of the Proton Therapy Center at Samsung Medical Center

Chung K, Han Y, Kim J, Ahn SH, Ju SG, Jung SH, Chung Y, Cho S, Jo K, Shin EH, Hong CS, Shin JS, Park S, Kim DH, Kim HY, Lee B, Shibagaki , Nonaka H, Sasai K, Koyabu Y, Choi C, Huh SJ, Ahn YC, Pyo HR, Lim DH, Park HC, Park W, Oh DR, Noh JM, Yu JI, Song S, Lee JE, Lee B, Choi DH

PURPOSE: The purpose of this report is to describe the proton therapy system at Samsung Medical Center (SMC-PTS) including the proton beam generator, irradiation system, patient positioning system, patient position...
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Analysis of Output Constancy Checks Using Process Control Techniques in Linear Accelerators

Oh SA, Yea JW, Kim SW, Lee R, Kim SK

The purpose of this study is to evaluate the results for the quality assurance through a statistical analysis on the output characteristics of linear accelerators belonging to Yeungnam University Medical...
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