Définition des contours prostatiques sur coupes tomodensitométriques: étude des discordances entre radiothérapeutes et entre examens

Oozeer, Raish; Chauvet, B.; Toy, BJ; Berger, C.; Garcia, R.; Félix-Faure, C.; Thanh, H Le; Reboul, F.

doi:10.1016/s1278-3218(99)80076-6

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…‐ 11 This may in fact be the most important source of variation in some cases. Intraobserver variability has also been studied, although usually, its magnitude is less than that of interobserver variation 8 …”

Section: Discussionmentioning

confidence: 99%

CT slice index and thickness: Impact on organ contouring in radiation treatment planning for prostate cancer

Berthelet¹,

Liu²,

Truong³

et al. 2003

J Applied Clin Med Phys

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Objective: To assess the impact of CT slice index and thickness (3 mm versus 5 mm) on (i) prostate volume, dimensions, and isocenter coordinates, (ii) bladder and rectal volumes, and (iii) DRR quality, in the treatment of prostate cancer. Methods: 16 patients with prostate cancer underwent two planning CT‐scans using 3 and 5 mm slice index/thickness. Prostate, bladder, and rectum were outlined on all scans. Prostate isocenter coordinates, maximum dimensions, and volumes were compared along with bladder and rectal volumes. Bladder volumes and maximum diameters were further investigated using a second observer. A comparative analysis of DRR quality was conducted as well as a dosimetric analysis using DVH. Results: The differences in measurements of prostate volume, isocenter coordinates and maximum dimensions between the 3 and 5 mm scans, were small and not statistically significant. Similar finding was seen for rectal volume. However, bladder volume was always larger on the 3 mm scan (mean difference=27.9 cc; SE=4.8 cc; 95% CI: 17.7−38.2 cc; p<0.001) and the findings were reproduced with the second observer (mean difference=31.9 cc; SE=4.7 cc; 95% CI: 21.9−41.9 cc; p<0.001). The differences in volume are caused by a slight increase in (1) the measurement of the longitudinal dimensions on the 3 mm scans, and (2) the slice by slice measured bladder area on the 3 mm scans. The latter is due to partial volume effect. The 3 mm DRR were slightly better than the 5 mm DRR. The bladder DVH differed significantly in some patients. Conclusion: Bladder volume is significantly larger on the 3 mm scans. Differences in contoured areas may be accounted for, in part, by the partial volume effect.PACS number(s): 87.57.–s, 87.53.–j

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Section: Discussionmentioning

confidence: 99%

CT slice index and thickness: Impact on organ contouring in radiation treatment planning for prostate cancer

Berthelet¹,

Liu²,

Truong³

et al. 2003

J Applied Clin Med Phys

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“…Several studies have reported errors in the tumor planning target volume (PTV) ranging from 5.5 mm to 8 mm, which can significantly affect the planned and delivered treatment positions [2,3,4]. Various solutions, such as CT treatment planning and beam visualization, have proven effective in reducing setup errors [5]. However, to deliver the correct dose to a patient, it is crucial to minimize all potential sources of error.…”

Section: Introductionmentioning

confidence: 99%

Uncertainties in prostate localization: A study in a laboratory setting.

Aime M Gloi

2024

World J. Adv. Res. Rev.

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Purpose: The main goal of this study is to minimize systematic errors by utilizing linear regression to determine the position of gold seed markers that were implanted in a wax phantom, using EPID images in a controlled laboratory setting. Materials and Methods: Pairs of orthogonal portal images were generated and carefully examined, while the phantom was subjected to a known displacement in either the lateral or superior-inferior direction. The measured seed displacement was then compared with the average seed displacement determined from the orthogonal EPID images. The accuracy of the inferred seed positions from the portal images was evaluated using linear regression, concordance correlation coefficient (CCC), intraclass correlation coefficients (ICC), and Bland-Altman plots. Results: The average displacement errors were found to be 3.2 mm, 2.6 mm, 2.4 mm, and 6.7 mm in the lateral left, lateral right, cranio-caudal (inward), and cranio-caudal (outward) directions, respectively. Conclusion: The results suggest that utilizing linear regression can significantly reduce the systematic errors described in this study and are consistent with previously published findings on setup errors.

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Bénéfice volumétrique de la radiothérapie guidée par l’image dans les cancers prostatiques : marges et cartographies de probabilité de présence

Cazoulat

Crevoisier

Simon

et al. 2009

Cancer/Radiothérapie

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Définition des contours prostatiques sur coupes tomodensitométriques: étude des discordances entre radiothérapeutes et entre examens

Cited by 8 publications

References 16 publications

CT slice index and thickness: Impact on organ contouring in radiation treatment planning for prostate cancer

CT slice index and thickness: Impact on organ contouring in radiation treatment planning for prostate cancer

Uncertainties in prostate localization: A study in a laboratory setting.

Bénéfice volumétrique de la radiothérapie guidée par l’image dans les cancers prostatiques : marges et cartographies de probabilité de présence

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