Idealized line source configuration for permanent 125I prostate implants

Leclerc, Ghyslain

doi:10.1016/j.radonc.2004.04.001

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…This approximation has been proved to be valid. 21 For any given setup ͑prostate geometry, seed activity level, and seed positions͒, four different dose distributions are calculated corresponding to the four different dose calculation techniques investigated in this article.…”

Section: A Treatment Planning Systemmentioning

confidence: 99%

“…The TG-43u1 calculations overestimate the D 90 values calculated with MCP by 5.8%-12.8%, depending on the seed density and prostate size. This difference corresponds to [13][14][15][16][17][18][19][20][21][22][23][24][25][26] Gy. This is illustrating the systematic effect when taking into account the interseed attenuation and prostate composition corrections in the dosimetry.…”

Section: Overall Comparisonmentioning

confidence: 99%

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Impact of interseed attenuation and tissue composition for permanent prostate implants

et al. 2006

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The purpose is to evaluate the impact of interseed attenuation and prostate composition for prostate treatment plans with 125I permanent seed implants using the Monte Carlo (MC) method. The effect of seed density (number of seeds per prostate unit volume) is specifically investigated. The study focuses on treatment plans that were generated for clinical cases. For each plan, four different dose calculation techniques are compared: TG-43 based calculation, superposition MC, full MC with water prostate, and full MC with realistic prostate tissue. The prostate tissue description is from the ICRP report 23 (W. S. Snyer, M. J. Cook, E. S. Nasset, L. R. Karkhausen, G. P. Howells, and I. H. Tipton, "Report of the task group on reference man," Technical Report 23, International Commission on Radiological Protection, 1974). According to the comparisons, the seed density has an influence on interseed attenuation. A plan with a typical low seed density (42 0.6 mCi seeds in a 26 cm3 prostate) suffers a 1.2% drop in the CTV D90 value due to interseed attenuation. A drop of 3.0% is calculated for a higher seed density (75 0.3 mCi seeds, same prostate). The influence of the prostate composition is similar for all seed densities and prostate sizes. The difference between MC simulations in water and MC simulations in prostate tissue is between 4.4% and 4.8% for the D90 parameter. Overall, the effect on D90 is ranging from 5.8% to 12.8% when comparing clinically approved TG-43 and MC simulations in prostate tissue. The impact varies from one patient to the other and depends on the prostate size and the number of seeds. This effect can reach a significant level when reporting correlations between clinical effect and deposited dose.

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Section: A Treatment Planning Systemmentioning

confidence: 99%

Section: Overall Comparisonmentioning

confidence: 99%

Impact of interseed attenuation and tissue composition for permanent prostate implants

et al. 2006

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“…Leclerc et al 14 and Fox et al 15 have compared a line source and a point source formalism to study anisotropy effects and have found no significant differences between the two approximations. In a similar way, Chibani et al 16 have compared the effects of a point source formalism, an idealized line source formalism, and an idealized Monte Carlo (MC) simulation with material fully defined and have found similar differences between the Monte Carlo and either line source or point source formalism.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the effect of seed orientation in postplanning dosimetry of low‐dose‐rate prostate brachytherapy

et al. 2014

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“…This information ͑seed center and orientation in 2D͒ was then used to perform 3D reconstruction of each individual seed including orientation. 38 However, their method fails to correctly reconstruct seeds in large clusters of more than three seeds. Another approach, proposed by Siebert et al, 32 separately back-projects the tip and end positions of each seed image and uses a heuristic search algorithm to efficiently solve the NP3 matching problem.…”

Section: Discussionmentioning

confidence: 99%

Reconstruction of brachytherapy seed positions and orientations from cone‐beam CT x‐ray projections via a novel iterative forward projection matching method

et al. 2010

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This work describes a novel, accurate, and completely automatic method for reconstructing seed orientations, as well as centroids, from a small number of radiographic projections, in support of intraoperative planning and adaptive replanning. Unlike standard back-projection methods, gIFPM avoids the need to match corresponding seed images on the projections. This algorithm also successfully reconstructs overlapping clustered and highly migrated seeds in the implant. The accuracy of better than 1 mm and 6 degrees demonstrates that gIFPM has the potential to support 2D Task Group 43 calculations in clinical practice.

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Idealized line source configuration for permanent 125I prostate implants

Cited by 8 publications

References 20 publications

Impact of interseed attenuation and tissue composition for permanent prostate implants

Impact of interseed attenuation and tissue composition for permanent prostate implants

Quantifying the effect of seed orientation in postplanning dosimetry of low‐dose‐rate prostate brachytherapy

Reconstruction of brachytherapy seed positions and orientations from cone‐beam CT x‐ray projections via a novel iterative forward projection matching method

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