The “one-isocenter-quarter-beam” technique as a radiotherapy of breast cancer patients

Urbańczyk, Hubert; Hawrylewicz, Leszek; Ganowicz, M.; Misztal, L.; Woźniak, Bożena; Wydmański, Jerzy; Miszczyk, Leszek

doi:10.1016/s1507-1367(05)71104-4

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Results also showed noticeable difference for the 105% dose coverage or even higher level of doses for the DIT compared with the MIT. Previous investigations have reported similar findings (4‐7,11‐13) …”

Section: Discussionsupporting

confidence: 77%

Comparing the monoisocentric and dual isocentric techniques in chest wall radiotherapy of mastectomy patients

Banaei

Hashemi

Bakhshandeh

2015

J Applied Clin Med Phys

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The monoisocentric (MIT) and dual isocentric (DIT) techniques are compared for the mastectomy patients undergoing chest wall radiotherapy, and a new practical method is suggested for determining the dose calculation reference point to be used in the MIT. Data of 18 mastectomy patients having chest wall radiotherapy were used. To find the appropriate dose calculation reference point for the MIT, the target tissue was divided into nine regions with 17 points as the appropriate candidates. After finding the best reference point for the MIT, dose calculations were made for each patient based on the MIT and DIT to determine the dose distributions of the target volume and organs at risk. The lateral component of the dose calculation reference point was found to be located at one‐third of the distance between the geometrical center and the lateral border of the chest wall in the lateral direction toward the outer border. The longitudinal component of this point was found to be located at the geometrical center of the chest wall with a depth located around 2–3 cm under the patients’ skin. There was no significant difference between the two radiotherapy planning techniques (MIT and DIT) regarding the dose distributions in the organs at risk and the 95% of the prescribed dose coverage of the target tissue. However, a significant difference for the 105% of the prescribed dose coverage, maximum dose delivered to the target tissue, and the level 2 lymph nodes dose was found, with the DIT showing higher values. Because of the good matching and no superposition observed between the treatment fields in the MIT, it was expected and confirmed that the hot and cold regions (with higher and lower doses than the prescribed dose) with the MIT are significantly fewer than that of the DIT. Therefore, to perform a better conformal radiotherapy for the patients having mastectomy, it could be recommended to use the MIT instead of the DIT and other conventional techniques.PACS numbers: 87.53.Bn, 87.53.Kn, 87.55.D‐, 87.55.ne

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Section: Discussionsupporting

confidence: 77%

Comparing the monoisocentric and dual isocentric techniques in chest wall radiotherapy of mastectomy patients

Banaei

Hashemi

Bakhshandeh

2015

J Applied Clin Med Phys

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“…Urbancyzk et al compared the daily treatment times and treatment planning time between DIT and MIT and found a lower treatment time with MIT (8.3 versus 16.8 minutes). 22 Planning time, however, was higher (74.7 versus 59.7 minutes). In comparison, in the present study, the planning time was not estimated.…”

Section: Discussionmentioning

confidence: 89%

“…Urbancyzk et al describe a 'one isocentre quarter beam technique' in 68 breast cancer patients using orfit for immobilisation in the supine position and show acceptable in vivo dosimetry. 22 Galecki et al describe the implementation of MIT in 18 breast cancer patients. 23 The treatment set-up time was short (actual times not given), and there were no recurrences in 10month follow-up period.…”

Section: Discussionmentioning

confidence: 99%

Mono versus dual isocentric technique for breast cancer radiotherapy: evaluation of planning, dosimetry and treatment delivery

et al. 2020

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Aim: To compare the dosimetry and reproducibility of set-up with monoisocentric technique (MIT) and dual isocentric technique (DIT) in adjuvant breast radiotherapy (RT). Material and methods: Breast cancer patients treated with MIT or DIT were retrospectively studied. The organ-at-risk dose was compared between two groups. All patients underwent set-up verification with an electronic portal imaging device, and set-up time was recorded for each fraction. Treatment reproducibility was assessed in terms of systematic and random error. Results: Twenty patients were included (11 right and 9 left-sided tumours) and ten received whole breast RT, while the rest received chest wall RT. Overall, the mean heart dose was less with MIT (0.40 versus 0.79, p = <0.001) as well as in left-sided tumours (0.37 versus 0.98, p = 0.003). The maximum dose at the field junction was significantly higher with DIT (43 Gy, 107%, p = 0.003). The maximum total error was 1 cm in lateral for supraclavicular field and 8 mm in superior–inferior in tangents for both techniques. There was no difference in set-up errors between the two techniques. Findings: MIT resulted in better dose homogeneity at the field junctions and reduced mean heart dose as compared to DIT. MIT is safe for implementation in clinical practice for breast cancer treatment. Conclusion: This study is one of the few studies comparing MIT with DIT in terms of the dosimetry and the first one to compare set-up errors between the two techniques. The ease of set-up and better dosimetry with MIT was achieved.

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Dosimetric Analysis of Three Different Radiotherapy Techniques in Patients with Breast Cancer and Their Impact on Organs at Risk (OAR)

Jagtap¹,

Saikia²,

Sharma³

et al. 2018

IJMPCERO

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Aim: Dosimetric analysis of three different Radiotherapy techniques in patients with Breast Cancer and their impact on OAR's. Materials and Methods: 12 patients of Carcinoma Breast who received breast radiotherapy were selected for analysis. Computed tomography (CT) simulation image data sets were retrieved. Planning target Volume (PTV), heart and ipsilateral lung were contoured for planning and analysis of doses. Three different plans using conventional bi-tangential fields were prepared, Plan 1 with SAD full beam with wedge (SAD-FBW), Plan 2 with SSD half beam with wedge (SSD-HBW) and plan 3 with SSD half beam without wedge techniques (SSD-HBO) in CMS Xio TPS. Statistical analysis was done using SPSS version 16.0. Results: The PTV coverage was significantly better in SAD-FBW techniques when compared with the other two techniques i.e. SSD-HBW (mean = 92.33, SD = 4.69, p = 0.005) and SSD-HBO (mean = 75.05, SD = 11.92, p = 0.002). The mean heart doses were significantly better in SAD-FBW compared to SSD-HBW (mean = 3.75, SD = 2.27, p = 0.017) but in SSD-HBO technique mean heart doses were better than SAD-FBW technique (mean = 3.27, SD = 1.94, p = 0.004). Similarly, the left lung V20 values were significantly better in SSD-HBO technique than SAD-FBW technique (mean = 11.75, SD = 4.34, p = 0.004) but there was statistically insignificant difference between the SAD-FBW and SSD-HBW techniques.

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The “one-isocenter-quarter-beam” technique as a radiotherapy of breast cancer patients

Cited by 3 publications

References 7 publications

Comparing the monoisocentric and dual isocentric techniques in chest wall radiotherapy of mastectomy patients

Comparing the monoisocentric and dual isocentric techniques in chest wall radiotherapy of mastectomy patients

Mono versus dual isocentric technique for breast cancer radiotherapy: evaluation of planning, dosimetry and treatment delivery

Dosimetric Analysis of Three Different Radiotherapy Techniques in Patients with Breast Cancer and Their Impact on Organs at Risk (OAR)

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