Dual-Fields Rotational Total Skin Electron Therapy: Investigation and Implementation ()
Affiliation(s)
1Northwestern Medicine Cancer Center, Warrenville and Geneva, Illinois, USA.
2Department of Radiation Oncology, Loyola University Medical Center, Maywood, Illinois, USA.
3The Austin Center for Radiation Oncology, Austin, Texas, USA.
ABSTRACT
Purpose: To present a protocol of a dual-field rotational
(DFR) total skin electron therapy (TSET) and to provide an assessment of
clinical implementation, dosimetry properties, and skin dose evaluation. Methods
and Materials: The DFR-TSET combined the Stanford 6-field and McGill
rotational methods. Dual 6 MeV electron beams in high dose total skin electron
mode were used for DFR-TSET on a commercial linac. Beam profiles and dosimetric
properties were measured using solid phantoms. The dose rate at expanded
source-to-surface distance (SSD) was a combination of static rate and
rotational rate. In vivo dosimetry of patient skin was performed on patients’ skin using film, metal oxide semiconductor
field-effect transistors (MOSFET), and optically stimulated luminescent dosimeters (OSLD). Results: Dual field
rotational total skin electron therapy exhibited good (≤±10%) uniformity in the beam profiles in the
vertical direction at an extended SSD of 332 cm with a gantry angulation of ±20˚ deviated from the horizontal direction. In-vivo measurements confirmed acceptable uniformity of the patients’ total body
surfaces and revealed anatomically self-blocked or shielded areas where underdosing
occurred. Conclusions: The clinical implementation of DFR-TSET
effectively utilizes the special mode on a linac. This technique provides short
beam-on times, uniform dose distribution, large treatment field, and reduced
dose of x-ray contamination to the patients. In-vivo measurements indicate satisfactory delivery and dose
uniformity of the prescribed dose. Electron boost fields are recommended at
normal SSDs to address underdosed areas.
Share and Cite:
Xu, M. , Rusu, I. and Garza, R. (2024) Dual-Fields Rotational Total Skin Electron Therapy: Investigation and Implementation.
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology,
13, 1-15. doi:
10.4236/ijmpcero.2024.131001.
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