SU‐E‐T‐537: Photon Beam Modeling and Verification of Collapsed Cone Convolution Algorithm for Dose Calculation in a Radiation Treatment Planning System

Jung, Jin‐Woo; Cho, W; Lee, J; Kim, D; Kim, M; Suh, Tae Suk

doi:10.1118/1.4735626

Cited by 2 publications

(2 citation statements)

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“…All treatment plans were designed as conformal with 6 and 15 MV energies by using of the CorePLAN three-dimensional treatment planning software. This treatment planning system uses the collapsed cone convolution (CCC) and Equivalent Tissue Air Ratio (ETAR) algorithms for dose calculations (Moradi et al, 2012;Jung et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

Evaluation the Effect of Photon Beam Energies on Organ at Risk Doses in Three-Dimensional Conformal Radiation Therapy

Molazadeh¹,

Saberi²,

Rahmatnezhad³

et al. 2013

RJASET

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As regards, the selection of appropriate energy in radiotherapy tumors that are placed in non-homogen areas is important, so the aim of the present study is evaluating the effect of 6 and 15MV photon beam energies on dose distribution in 3D-CRT for lower esophageal and rectal cancers. 12 patients with lower esophageal cancer and 12 patients with rectal cancer respectively, with the prescription dose of 7000 cGy and 5040 cGy were studied. For treatment of esophagus the three-field technique and for treatment of rectum the four-field technique was used. In the thoracic area, the spinal cord and in the pelvis, the bladder and head of femurs were considered as OARs. For comparing the results, all parameters used for treatment planning except the photon beam energy were kept constant. After performing the treatment planning with two different energies in each region, the received dose rate of spinal cord, bladder and head of femurs as OARs and dose distribution in PTVs were studied. The results of this study showed that the difference between doses received by OARs in 6MV and 15MV therapeutic plans, resulted 5.2, 5.06 and -9.14%, respectively. Also the PTVs received dose difference of esophagus and rectum in the performed therapeutic plans with energy of 6 MV than energy of 15MV is 1.52 and -0.63%, respectively. We found that using of low energy photons in lower esophageal treatment and high energy photons in the rectal treatment provides the better dose coverage. Finally, with such as therapeutic plans the cumulative dose of organs at risk will be reduced.

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Section: Methodsmentioning

confidence: 99%

Evaluation the Effect of Photon Beam Energies on Organ at Risk Doses in Three-Dimensional Conformal Radiation Therapy

Molazadeh¹,

Saberi²,

Rahmatnezhad³

et al. 2013

RJASET

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“…The pencil beam convolution algorithm uses the Batho power law (BPL), modi$ied Batho power law (MBPL), and equivalent tissue-air ratio (ETAR) to correct the inhomogeneous region in the irradiation volume. The collapsed cone convolution (CCC) algorithm supposes that the dose kernel composed the cone direction to transport, attenuation, and deposits on the axis (16,17) . With this algorithm, a deposited dose is calculated by the accumulated energy on the line passing through the center of the cone.…”

Section: Introductionmentioning

confidence: 99%

Dose distribution evaluation of various dose calculation algorithms in inhomogeneous media

Kim

Suh

Choe

et al. 2016

IJRR

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Background: Dose calcula on algorithms play a very important role in predic ng the explicit dose distribu on. We evaluated the percent depth dose (PDD), lateral depth dose profile, and surface dose volume histogram in inhomogeneous media using calcula on algorithms and inhomogeneity correc on methods. Materials and Methods: The homogeneous and inhomogeneous virtual slab phantoms used in this study were manufactured in the radia on treatment planning system to represent the air, lung, and bone density with planned radia on treatment of 6 MV photons, a field size of 10 × 10 cm 2 , and a source-to-surface distance of 100 cm. Results: The PDD of air density slab for the Acuros XB (AXB) algorithm was differed by an average of 20% in comparison with other algorithms. Rebuild up occurred in the region below the air density slab (10-10.6 cm) for the AXB algorithm. The lateral dose profiles for the air density slab showed rela vely large differences (over 30%) in the field. There were large differences (20.0%-26.1%) at the second homogeneous-inhomogeneous junc on (depth of 10 cm) in the field for all calcula on methods. The surface dose volume histogram for the pencil beam algorithm showed a response that was approximately 4% lower than that for the AXB algorithm. Conclusion: The dose calcula on uncertain es were shown to change at the interface between different densi es and in varied densi es using the dose calcula on methods. In par cular, the AXB algorithm showed large differences in and out of the field in inhomogeneous media.

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SU‐E‐T‐537: Photon Beam Modeling and Verification of Collapsed Cone Convolution Algorithm for Dose Calculation in a Radiation Treatment Planning System

Abstract: In this study, we verified the accuracy of CCC algorithm in the TPS. Calculated results by our implemented algorithm was well satisfied with measured dose at small field size (〈20 7 times; 20 cm ). Our next study will perform to compensate theses inconsistencies.

Cited by 2 publications

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Evaluation the Effect of Photon Beam Energies on Organ at Risk Doses in Three-Dimensional Conformal Radiation Therapy

Evaluation the Effect of Photon Beam Energies on Organ at Risk Doses in Three-Dimensional Conformal Radiation Therapy

Dose distribution evaluation of various dose calculation algorithms in inhomogeneous media

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