Comparison of positioning error in stereotactic irradiation for brain cancers by using two different thermoplastic masks

Authors

  • Woraya Nguanthean Division of Radiation Oncology, King Chulalongkorn Memorial Hospital, Thai Red Cross Society
  • Rinlita wannahirunkorn Radiological Technology Department, Faculty of Science, Ramkhamhaeng University
  • Sarin kotesombut Radiological Technology Department, Faculty of Science, Ramkhamhaeng University
  • Phaiboon Aunsamoe Radiological Technology Department, Faculty of Science, Ramkhamhaeng University
  • Paowarin Khayaiwong Radiological Technology Department, Faculty of Science, Ramkhamhaeng University

Keywords:

Thermoplastic mask, Stereotactic radiosurgery, Stereotactic radiotherapy, Brain cancers, Short mask standard type, Short mask special type

Abstract

Background: Stereotactic irradiation is a radiotherapy technique used to treat brain cancers, it requires high accuracy of positioning. It is necessary to provide suitable immobilization devices to improve patient positioning reproducibility. Two types of short thermoplastic masks were used for brain cancers treatment in Division of Radiation Oncology, King Chulalongkorn Memorial Hospital; the standard type and the special type.

Objective: To compare positioning error in stereotactic irradiation for brain cancers by using two different thermoplastic masks.

Materials and Methods:  The data were collected from a total of 30 brain cancer patients by stereotactic radiation therapy (Stereotactic radiosurgery: SRS or Stereotactic radiotherapy: SRT), radiation was delivered from Linear accelerator (LINAC) (Varian, TrueBEAM, USA). The patients were divided into 2 groups including the short mask standard type and the special type. The positioning error of patients were collected from pre-treatment verification using Cone beam computed tomography (CBCT) device. The radiation therapist’s satisfaction survey questions were assessed on the use of both short thermoplastic masks. The satisfied score was scaled from 1 to 5. 

Results: The positioning error of standard type in Antero-Posterior (AP), Superior-Inferior (SI) and Medio-Lateral (ML) translations was -0.43±1.34 (mean+SD), -0.40±2.18 and 0.36±1.34 millimeters respectively and special type was -0.28±1.21, 0.58±1.58 and 0.14±1.28 millimeters, respectively. The error between using the standard type and the special type was significantly different in SI but not significantly different for AP and ML directions. There was no difference in satisfaction scores evaluated by radiation therapist between the standard and special types of masks. However, there was a statistically significant difference of satisfaction in favor of the special type when the masks were reused. 

Conclusion: There was a statistically significant difference in patient positioning in SI direction between two different thermoplastic masks in stereotactic radiation therapy for brain cancers but the errors of vertical and lateral directions were not significantly different. It was within ±3 millimeters.

References

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Published

2022-06-15

How to Cite

1.
Nguanthean W, wannahirunkorn R, kotesombut S, Aunsamoe P, Khayaiwong P. Comparison of positioning error in stereotactic irradiation for brain cancers by using two different thermoplastic masks. J Thai Assn of Radiat Oncol [Internet]. 2022 Jun. 15 [cited 2024 Mar. 29];28(1):R54-R64. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/252180

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Original articles