Treatment plan comparison for irradiation of multiple brain metastases with hippocampal avoidance whole brain radiotherapy and simultaneous integrated boost using the Varian Halcyon and the Elekta Synergy platforms

Kraft, Johannes; Weick, Stefan; Breuer, Kathrin; Lutyj, Paul; Bratengeier, Klaus; Exner, Florian; Richter, Anne; Tamihardja, Jörg; Lisowski, Dominik; Polat, Bülent; Flentje, Michael

doi:10.1186/s13014-022-02156-6

Cited by 2 publications

(2 citation statements)

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“…18 A planning study on whole brain irradiation with hippocampal avoidance and simultaneously integrated boost volumes for the increasingly common Varian Halcyon mentions the inability to perform corrections of rotational setup errors as one of the main limitations for the clinical use of this technique. 19 A head immobilization device that allows the rotational adjustment of patient positioning provides an alternative solution to the use of a 6DOF couch. So far, a head-supporting device was presented, which is restricted to corrections of pitch and yaw.…”

Section: Introductionmentioning

confidence: 99%

“…However, 6DOF couches are not available on all treatment machines and are associated with extra costs 18 . A planning study on whole brain irradiation with hippocampal avoidance and simultaneously integrated boost volumes for the increasingly common Varian Halcyon mentions the inability to perform corrections of rotational setup errors as one of the main limitations for the clinical use of this technique 19 …”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a head rest prototype for rotational corrections in three degrees of freedom

Schindhelm,

Razinskas,

Ringholz

et al. 2023

J Applied Clin Med Phys

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Cranial stereotactic irradiations require accurate reproduction of the planning CT patient position at the time of treatment, including removal of rotational offsets. A device prototype was evaluated for potential clinical use to correct rotational positional offsets in image‐guided radiotherapy workflow. Analysis was carried out with a prototype device “RPS head” by gKteso GmbH, rotatable up to 4° in three dimensions by hand wheels. A software tool accounts for the nonrectangular rotation axes and also indicates translational motions to be performed with the standard couch to correct the initial offset and translational shifts introduced by the rotational motion. The accuracy of angular corrections and positioning of an Alderson RANDO head phantom using the prototype device was evaluated for nine treatment plans for cranial targets. Corrections were obtained from cone beam computed tomography (CBCT) imaging. The phantom position was adjusted and the final position was then verified by another CBCT. The long‐term stability of the prototype device was evaluated. Attenuation by the device along its three main axes was assessed. A planning study was performed to evaluate if regions of high‐density material can be avoided during plan generation. The device enabled the accurate correction of rotational offsets in a clinical setup with a mean residual angular difference of (0.0 ± 0.1)° and a maximum deviation of 0.2°. Translational offsets were less than 1 mm. The device was stable over a period of 20 min, not changing the head support plate position by more than (0.7 ± 0.6) mm. The device contains high‐density material in the adjustment mechanism and slightly higher density in the support structures. These can be avoided during planning generation maintaining comparable plan quality. The head positioning device can be used to correct rotational offsets in a clinical setting.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%