Total scalp irradiation using helical tomotherapy

Nigel Orton, Hazim Jaradat, James Welsh, Wolfgang A. Tome

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Homogeneous irradiation of the scalp poses technical and dosimetric challenges due to the extensive, superficial, curved treatment volume. Conventional treatments on a linear accelerator use multiple matched electron fields or a combination of electron and photon fields. Problems with these techniques include dose heterogeneity in the target due to varying source-to-skin distance (SSD) and angle of beam incidence, significant dose to the brain, and the potential for overdose or underdose at match lines between the fields. Linac-based intensity-modulated radiation therapy (IMRT) plans have similar problems. This work presents treatment plans for total scalp irradiation on a helical tomotherapy machine. Helical tomotherapy is well-suited for scalp irradiation because it has the ability to deliver beamlets that are tangential to the scalp at all points. Helical tomotherapy also avoids problems associated with field matching and use of more than one modality. Tomotherapy treatment plans were generated and are compared to plans for treatment of the same patient on a linac. The resulting tomotherapy plans show more homogeneous target dose and improved critical structure dose when compared to state-of-the-art linac techniques. Target equivalent uniform dose (EUD) for the best tomotherapy plan was slightly higher than for the linac plan, while the volume of brain tissue receiving over 30 Gy was reduced by two thirds. Furthermore, the tomotherapy plan can be more reliably delivered than linac treatments, because the patient is aligned prior to each treatment based on megavoltage computed tomography (MVCT).

Original languageEnglish (US)
Pages (from-to)162-168
Number of pages7
JournalMedical Dosimetry
Volume30
Issue number3
DOIs
StatePublished - Sep 2005
Externally publishedYes

Fingerprint

Intensity-Modulated Radiotherapy
Scalp
irradiation
dosage
Therapeutics
brain
Electrons
Particle Accelerators
Brain
Photons
linear accelerators
Radiotherapy
radiation therapy
Tomography
electrons
incidence
tomography
Skin
Incidence
photons

Keywords

  • Conformal radiotherapy
  • IMRT
  • Scalp irradiation
  • Tomotherapy

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Health Professions(all)
  • Radiation

Cite this

Total scalp irradiation using helical tomotherapy. / Orton, Nigel; Jaradat, Hazim; Welsh, James; Tome, Wolfgang A.

In: Medical Dosimetry, Vol. 30, No. 3, 09.2005, p. 162-168.

Research output: Contribution to journalArticle

Orton, Nigel ; Jaradat, Hazim ; Welsh, James ; Tome, Wolfgang A. / Total scalp irradiation using helical tomotherapy. In: Medical Dosimetry. 2005 ; Vol. 30, No. 3. pp. 162-168.
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