The determination of virtual source position using convergent arcCOS method for scanning-passive scatter beam in carbon ion therapy

Qi, Y.; Zhang, Y-S.; Ye, Y-C.; Lee, T-F.; Wu, J-M.

doi:10.61186/ijrr.21.3.521

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Volume 21, Issue 3 (7-2023) Int J Radiat Res 2023, 21(3): 521-530 | Back to browse issues page

‎ 10.61186/ijrr.21.3.521

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Qi Y, Zhang Y, Ye Y, Lee T, Wu J. The determination of virtual source position using convergent arcCOS method for scanning-passive scatter beam in carbon ion therapy. Int J Radiat Res 2023; 21 (3) :521-530
URL: http://ijrr.com/article-1-4894-en.html

The determination of virtual source position using convergent arcCOS method for scanning-passive scatter beam in carbon ion therapy

Y. Qi

, Y-S. Zhang

, Y-C. Ye

, T-F. Lee

, J-M. Wu

Heavy Ion Center of Wuwei Cancer Hospital, Gansu Wuwei Academy of Medical Sciences, Gansu Wuwei Tumor Hospital, Wuwei city, Gansu province, China , 13830510999@163.com

Abstract: (1670 Views)

Background: We developed a convergent arcCOS (cACOS) technique capable of dealing with the virtual source position delivered by different carbon ion energies from the pattern of scanning-passive scatter beam in this study. Materials and Methods: A homemade large-format CMOS sensor and Gaf Chromic EBT3 films were used for the virtual source position measurement. The Gaf films were embedded in a self-designed rectangular plastic frame to tighten the films and set up on a treatment couch for irradiation in the air with the film perpendicular to the carbon ion beam at the point of nominal source-axis-distance (SAD) as well as upstream and downstream from the SAD. The horizontal carbon ion beam with 5 energies at a machine opening field size was carried out in this study. The virtual source position was determined with a convergent arcCOS method and compared with the linear regression by back projecting the FWHM to zero at a distance upstream from the various point of source-film distance. Results: The determination of virtual source position using convergent arcCOS method agrees with the method by back projecting the FWHM to zero, and for higher carbon ion energy has an obvious longer distance from the SAD since the more carbon ion beam energy, the less spreading affected by the horizontal and vertical magnetism, therefore, the distance of virtual source positions is decreased from SAD with high to low energy. Conclusion: We have developed a technique capable of dealing with the virtual source position with a convergent arcCOS method to avoid any manual measurement mistakes in scanning-passive scatter carbon ion beam. The method for investigating the virtual source position in the carbon ion beam in this study can also be used for external electrons and the proton.

Keywords: Carbon ion beams, virtual source position, scanning-passive scatter beam.

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Type of Study: Original Research | Subject: Radiation Biology

References

1. Sawkey DL and Faddegon BA (2009) Determination of electron energy, spectral width, and beam divergence at the exit window for clinical megavoltage X-ray beams. Med. Phys, 36: 698-707. [DOI:10.1118/1.3070547] [PMID] []

2. Sham E, Seuntjens J, Devic S (2008) Influence of focal spot on characteristics of very small diameter radiosurgical beams. Med Phys, 35: 3317-3330. [DOI:10.1118/1.2936335] [PMID]

3. Knöös T, Wieslander E, Cozzi L (2006) Comparison of dose calculation algorithms for treatment planning in external photon beam therapy for clinical situation. Phys Med Biol, 51: 5785-5807. [DOI:10.1088/0031-9155/51/22/005] [PMID]

4. Sterpin E, Tomsej M, De Smedt B (2007) Monte Carlo evaluation of the AAA treatment planning algorithm in a heterogeneous multilayer phantom and IMRT clinical treatments for an Elekta SL25 linear accelerator Med Phys, 34: 1665-1677. [DOI:10.1118/1.2727314] [PMID]

5. Bortfeld T and Schlegel W (2007) An analytical approximation of depth-dose distributions for theraputic proton beams. Phys Med Biol, 41: 1331-9. [DOI:10.1088/0031-9155/41/8/006] [PMID]

6. Chetty IJ, Curran B, Cygler JE (2007) Report of the AAPM task group No. 105: Issues associated with clinical implementation of Monte Carlo-based photon and electron external beam treatment planning. Med Phys, 34: 4818-4853. [DOI:10.1118/1.2795842] [PMID]

7. Kooy H, Rosenthal S, Engelsman M (2005) The prediction of output factors for spread-out proton Bragg peak fields in clinical practice Phys Med Biol, 50: 5847-56. [DOI:10.1088/0031-9155/50/24/006] [PMID]

8. Kooy H, Schaefer M, Rosenthal S (2003) Monitor unit calculations for range-modulated spread-out Bragg peak fields Phys Med Biol, 48: 2797-808. [DOI:10.1088/0031-9155/48/17/305] [PMID]

9. Petti PL (1992) Differential-pencil-beam dose calculation for charged particles. Med Phys, 19: 137-49. [DOI:10.1118/1.596887] [PMID]

10. Verhaegen F and Seuntjens J (2003) Monte Carlo modeling of external radiotherapy photon beams. Phys Med Biol, 48: R107-R164. [DOI:10.1088/0031-9155/48/21/R01] [PMID]

11. Russell KR, Isacsson U, Saxner M (2000) Implementation of pencil kernel and depth penetration algorithms for treatment planning of proton beams. Phys Med Biol, 45: 9-27. [DOI:10.1088/0031-9155/45/1/302] [PMID]

12. Reynaert N, van der Marck SC, Schaart DR (2007) Monte Carlo treatment planning for photon and electron beams. Radiat Phys Chem, 76: 643-686. [DOI:10.1016/j.radphyschem.2006.05.015]

13. Dreind R ,Georg D, Stock M ( 2014) Radiochromic film dosimetry: considerations on precision and accuracy for EBT2 and EBT3 type films. Med Phys, 24(2):153-163. [DOI:10.1016/j.zemedi.2013.08.002] [PMID]

14. Kamomae T, Miyabe Y, Sawada A (2011) Simulation for improvement of system sensitivity of radiochromic film dosimetry with different band-pass filters and scanner light intensities. Radiol Phys Technol, 4(2): 140-147. [DOI:10.1007/s12194-011-0113-6] [PMID]

15. García-Garduño OA, Lárraga-Gutiérrez JM, Rodríguez-Villafuerte M (2016) Effect of correction methods of radiochromic EBT2 films on the accuracy of IMRT QA. App Radi Isot, 107:121-126. [DOI:10.1016/j.apradiso.2015.09.016] [PMID]

16. Barbara S (2008) Proton dose calculation based on in-air fluence measurements, Phys Med Biol 53:1545-1562. [DOI:10.1088/0031-9155/53/6/003] [PMID]

17. Wu JM, Lee TF, Kuo CM (2012) A light field-based method to adjust rounded leaf end MLC position for split shape dose calculation correction in a radiation therapy treatment planning system, J Appl Clin Med Phys, 13(6): 3-18. [DOI:10.1120/jacmp.v13i6.3937] [PMID] []

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