Clinical evaluation of an immbolization system for stereotactic body radiotherapy using helical tomotherapy

Alonso N. Gutiérrez, Sotirios Stathakis, Richard L Crownover, Carlos Esquivel, Chengyu Shi, Nikos Papanikolaou

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In this study, a clinical evaluation of the Body Pro-Lok System combined with the TomoTherapy megavoltage computed tomography (MVCT) was performed for lung and liver stereotactic body radiotherapy (SBRT) to reduce interfractional setup uncertainty. Twenty patients treated with 3-5 fractions of SBRT were analyzed retrospectively. The Body Pro-Lok system was used in both CT simulation and during patient treatment setup. Patients were immobilized with a vacuum cushion placed posteriorly over the thoracic region, an abdominal compression plate, and a knee and foot sponge. Pretreatment MVCT scans of the TomoTherapy HI-ART II unit were fused with the planning kVCT before delivery of each fraction to determine the interfractional setup error. A total of 84 shifts were analyzed to assess the interfractional setup accuracy. Results showed that the mean interfractional setup errors and standard deviations were -0.9 ± 3.1 mm, 1.2 ± 5.5 mm, and 6.5 ± 2.6 mm for lateral (IEC-X), longitudinal (IEC-Y), and vertical (IEC-Z) variations, respectively. The maximum motion was 17.1 mm in the longitudinal direction. When all 3 translational coordinates were analyzed, a mean composite displacement vector of 8.2 ± 2.0 mm (range 4.1-11.7 mm) was obtained for all patients. Based on the findings, image-guided SBRT using the Body Pro-Lok system in conjunction with the MVCT of TomoTherapy is capable of minimizing interfractional setup error and improving treatment accuracy.

Original languageEnglish (US)
Pages (from-to)126-129
Number of pages4
JournalMedical Dosimetry
Volume36
Issue number2
DOIs
StatePublished - 2011

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Intensity-Modulated Radiotherapy
Radiosurgery
Tomography
Patient Simulation
Image-Guided Radiotherapy
Porifera
Vacuum
Uncertainty
Foot
Knee
Thorax
Lung
Liver
Therapeutics

Keywords

  • Immobilization
  • Stereotactic radiotherapy
  • Tomotherapy

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Clinical evaluation of an immbolization system for stereotactic body radiotherapy using helical tomotherapy. / Gutiérrez, Alonso N.; Stathakis, Sotirios; Crownover, Richard L; Esquivel, Carlos; Shi, Chengyu; Papanikolaou, Nikos.

In: Medical Dosimetry, Vol. 36, No. 2, 2011, p. 126-129.

Research output: Contribution to journalArticle

Gutiérrez, Alonso N. ; Stathakis, Sotirios ; Crownover, Richard L ; Esquivel, Carlos ; Shi, Chengyu ; Papanikolaou, Nikos. / Clinical evaluation of an immbolization system for stereotactic body radiotherapy using helical tomotherapy. In: Medical Dosimetry. 2011 ; Vol. 36, No. 2. pp. 126-129.
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