Long‐term observations of a patient with choroidal melanoma following fractionated stereotactic radiotherapy: A case report

Tokuuye, Koichi; Sumi, Minako; Kagami, Yoshikazu; Murayama, Shigeyuki; Ikeda, Hiroshi; Kaneko, Akihiro; Akine, Yasuyuki

doi:10.1034/j.1600-0420.2000.078004477.x

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Although a simple shell alone was used for linac-based small-field radiotherapy with fractionated SRT [23, 24], it was of utmost importance to overcome the technical challenge of immobilization of the affected eye in the appropriate position during the fractionated external beam therapy [7]. Various immobilization techniques for the affected eye have been reported [4, 8–15].…”

Section: Discussionmentioning

confidence: 99%

Feasibility study of a non-invasive eye fixation and monitoring device using a right-angle prism mirror for intensity-modulated radiotherapy for choroidal melanoma

Inoue

Masai

Shiomi

et al. 2016

Journal of Radiation Research

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We aimed to describe the feasibility and efficacy of a novel non-invasive fixation and monitoring (F-M) device for the eyeballs (which uses a right-angle prism mirror as the optic axis guide) in three consecutive patients with choroidal melanoma who were treated with intensity-modulated radiotherapy (IMRT). The device consists of an immobilization shell, a right-angle prism mirror, a high magnification optical zoom video camera, a guide lamp, a digital voice recorder, a personal computer, and a National Television System Committee standard analog video cable. Using the right-angle prism mirror, the antero–posterior axis was determined coincident with the optic axis connecting the centers of the cornea and pupil. The axis was then connected to the guide light and video camera installed on the couch top on the distal side. Repositioning accuracy improved using this method. Furthermore, the positional error of the lens was markedly reduced from ±1.16, ±1.68 and ±1.11 mm to ±0.23, ±0.58 and ±0.26 mm in the horizontal direction, and from ±1.50, ±1.03 and ±0.48 mm to ±0.29, ±0.30 and ±0.24 mm in the vertical direction (Patient #1, #2 and #3, respectively). Accordingly, the F-M device method decreased the planning target volume size and improved the dose–volume histogram parameters of the organ-at-risk via IMRT inverse planning. Importantly, the treatment method was well tolerated.

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