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Brualla-González L, Vázquez-Luque A, Zapata M, González-Castaño DM, Luna-Vega V, Guiu-Souto J, Prieto-Pena J, García T, Granero D, Vicedo A, Rosellò J, Pombar M, Gómez F, Pardo-Montero J. Development and clinical characterization of a novel 2041 liquid-filled ionization chambers array for high-resolution verification of radiotherapy treatments. Med Phys 2018; 45:1771-1781. [PMID: 29446083 DOI: 10.1002/mp.12816] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 12/10/2017] [Accepted: 02/03/2018] [Indexed: 11/10/2022] Open
Abstract
PURPOSE The aim of this study was to present a novel 2041 liquid-filled ionization chamber array for high-resolution verification of radiotherapy treatments. MATERIALS AND METHODS The prototype has 2041 ionization chambers of 2.5 × 2.5 mm2 area filled with isooctane. The detection elements are arranged in a central square grid of 43 × 43, totally covering an area of 107.5 × 107.5 mm2 . The central inline and cross-line are extended to 227 mm and the diagonals to 321 mm to be able to perform profile measurements of large fields. We have studied stability, pixel response uniformity, dose rate dependence, depth and field size dependence and anisotropy. We present results for output factors, tongue-and-groove, garden fence, small field profiles, irregular fields, and verification of dose planes of patient treatments. RESULTS Comparison with other detectors used for small field dosimetry (SFD, CC13, microDiamond) has shown good agreement. Output factors measured with the device for square fields ranging from 10 × 10 to 100 × 100 mm2 showed relative differences within 1%. The response of the detector shows a strong dependence on the angle of incident radiation that needs to be corrected for. On the other hand, inter-pixel relative response variations in the 0.95-1.08 range have been found and corrected for. The application of the device for the verification of dose planes of several treatments has shown gamma passing rates above 97% for tolerances of 2% and 2 mm. The verification of other clinical fields, like small fields and irregular fields used in the commissioning of the TPS, also showed large passing rates. The verification of garden fence and tongue-and-groove fields was affected by volume-averaging effects. CONCLUSIONS The results show that the liquid filled ionization chamber prototype here presented is appropriate for the verification of radiotherapy treatments with high spatial resolution. Recombination effects do not affect very much the verification of relative dose distributions. However, verification of absolute dose distributions may require normalization to a radiation field which is representative of the dose rate of the treatment delivered.
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Affiliation(s)
- Luis Brualla-González
- Servicio de Radiofísica, ERESA, Hospital General Universitario de Valencia, Avd. Tres Cruces 2, 46014, Valencia, Spain
| | - Aurelio Vázquez-Luque
- Detection and Radiation Technologies (DART), Edificio Emprendia, 15782, Santiago de Compostela, Spain.,Departamento de Física de Partículas, Universidade de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain
| | - Martín Zapata
- Servizo de Radiofísica e Protección Radiolóxica, Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Diego Miguel González-Castaño
- Laboratorio de Radiofísica, RIAIDT, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain.,Grupo de Imaxe Molecular, Instituto de Investigación Sanitaria (IDIS), Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Víctor Luna-Vega
- Servizo de Radiofísica e Protección Radiolóxica, Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Jacobo Guiu-Souto
- Servizo de Radiofísica e Protección Radiolóxica, Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Juan Prieto-Pena
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain
| | - Trinitat García
- Servicio de Radiofísica, ERESA, Hospital General Universitario de Valencia, Avd. Tres Cruces 2, 46014, Valencia, Spain
| | - Domingo Granero
- Servicio de Radiofísica, ERESA, Hospital General Universitario de Valencia, Avd. Tres Cruces 2, 46014, Valencia, Spain
| | - Aurora Vicedo
- Servicio de Radiofísica, ERESA, Hospital General Universitario de Valencia, Avd. Tres Cruces 2, 46014, Valencia, Spain
| | - Joan Rosellò
- Servicio de Radiofísica, ERESA, Hospital General Universitario de Valencia, Avd. Tres Cruces 2, 46014, Valencia, Spain
| | - Miguel Pombar
- Servizo de Radiofísica e Protección Radiolóxica, Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain.,Grupo de Imaxe Molecular, Instituto de Investigación Sanitaria (IDIS), Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Faustino Gómez
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain.,Grupo de Imaxe Molecular, Instituto de Investigación Sanitaria (IDIS), Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
| | - Juan Pardo-Montero
- Servizo de Radiofísica e Protección Radiolóxica, Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain.,Grupo de Imaxe Molecular, Instituto de Investigación Sanitaria (IDIS), Complexo Hospitalario Universitario de Santiago, Travesía da Choupana s/n, 15706, Santiago de Compostela, Spain
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