IMRT Plan Evaluation according to ICRU Report 83

Figueira, Ana Rita; Monteiro, A.; Meireles, P.; Carvalho, A.; Alves, Luis Guilherme Rosifini; Fontes, Paulo Roberto Ott; Reis, T.; Batel, V.; Pinto, Glauce Aparecida

doi:10.1016/j.ijrobp.2011.06.1506

Cited by 3 publications

(2 citation statements)

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“…According to ICRU Report 83 [25], in each plan, the dose-volume histogram (DVH) was exercised to extract maximum and mean dose (D max , D mean ) of the PTV, D 2% , D 95% , D 98% (doses covered 2%, 95%, and 98% of the PTV's volume, respectively), and V 100% (volume of PTV receiving 100% of the prescribed dose). Uniformity index (UI), homogeneity index (HI), and conformity index (CI) were used to evaluate the target coverage.…”

Section: Target and Oars Dose Evaluation Metricsmentioning

confidence: 99%

Investigating the number of radiation fields in intensity-modulated radiotherapy plans of optic nerve sheath meningioma patients using dose gradient index

Mazloomi

Abedi

Shanei

et al. 2022

Biomed. Phys. Eng. Express

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Purpose: In optic nerve radiotherapy, vital organs are very close to the target volume, they are highly sensitive to radiation and have low dose tolerance. In this regard, evaluating dose fall-off steepness around the target volume is required to assess various intensity-modulated radiation therapy (IMRT) plans in the treatment of the optic nerve sheath meningioma (ONSM) patients. Materials and Methods: Thirteen ONSM patients were analyzed with three IMRT techniques, including three (IMRT-3F), five (IMRT-5F), and seven fields (IMRT-7F). These plans were studied using Dmean, Dmax, D2%, D98%, V100%, uniformity index (UI), homogeneity index (HI), conformity index (CI), and specifically the dose gradient indices (DGIs). Results: The values of Dmax and Dmean for IMRT-3F, IMRT-5F and IMRT-7F were (5637.42 ± 57.08, 5322.84 ± 83.86), (5670.51 ± 67.87, 5383.00 ± 58.45), and (5692.99 ± 31.65, 5405.72 ± 51.73), respectively, which were increased with increment in the number of IMRT fields from 3 to 7. The UI and HI indices were significantly different between IMRT-3F and IMRT-7F (p=0.010 and p=0.005, respectively), and CI was close to the ideal value (0.99±0.01) in IMRT-7F. The significant findings of the dose gradient indices represented smaller values in IMRT-7F, which led to a faster dose fall-off, particularly at the 70%-85% isodose levels around the target. Conclusion: Increasing the number of radiation fields in IMRT treatment plans of ONSM patients had a considerable difference in both the dosimetric parameters of the target volume and at-risk organs, as well as the dose gradient indices. Overall, IMRT-7F could be considered as a preferred technique in the treatment of this meningioma.

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Section: Target and Oars Dose Evaluation Metricsmentioning

confidence: 99%

Investigating the number of radiation fields in intensity-modulated radiotherapy plans of optic nerve sheath meningioma patients using dose gradient index

Mazloomi

Abedi

Shanei

et al. 2022

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

show abstract

“…The use of qualitative plan evaluation by visual analysis of an isodose distribution in IMRT, VMAT, and DCAT plan evaluation complements the quantitative approaches recommended by the International Commission on Radiation Units and Measurements 83 and other literature [20,21]. Utilising VERT, the PTV coverage can be checked by specifying the reference dose based on the plan goals on the VERT system.…”

Section: Dose Analysismentioning

confidence: 99%