Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy.

Introduction: Clinical evaluation of a two-dimensional (2D) liquid-filled ion chamber detector array used in the verification of highly modulated small beams of stereotactic body radiation therapy (SBRT) has been conducted.

Materials And Methods: Measurements with the Octavius 1000 SRS (PTW, Freiburg, Germany) detector with 977 liquid-filled ion chambers were compared against EDR2 film and PTW Octavius Seven29. The performance of detector array has been evaluated on ten SBRT patient plans.

Stereotactic body radiation therapy patient specific quality assurance using a two-dimensional array at extended source to surface distance.

Methods: Five patients with 38 fields have been analyzed in this study. The plans were optimized for the following clinical sites: one liver, one lung, one brain, one prostate and one spine. The detector array used for the measurements was the PTW Seven29 array.

Characterization of a two-dimensional liquid-filled ion chamber detector array used for verification of the treatments in radiotherapy.

Purpose: The purpose of the study is to investigate the characteristics of a two-dimensional (2D) liquid-filled ion chamber detector array, which is used for the verification of radiotherapy treatment plans that use small field sizes of up to 10 × 10 cm.

Methods: The device used in this study was Octavius 1000 SRS model (PTW, Freiburg, Germany). Its 2D array of detectors consists of 977 liquid-filled ion chambers arranged over an area of 11 × 11 cm.