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Feasibility Study of the Real-Time IMRT Dosimetry Using a Scintillation Screen  

Lim Sang Wook (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Yi Byong Yong (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Ko Young Eun (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Ji Young Hoon (Department of Radiation Oncology, Korea Institute of Radiological & Medical Sciences Medicine)
Kim Jong Hoon (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Ahn Seung Do (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Lee Sang Wook (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Shin Seong Soo (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Kwon Soo-Il (Department of Medical Physics, Kyonggi University)
Choi Eun Kyoung (Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
Publication Information
Radiation Oncology Journal / v.22, no.1, 2004 , pp. 64-68 More about this Journal
Abstract
Purpose : To study the feasibility of verifying real-time 2-D dose distribution measurement system with the scintillation screen for the quality assurance. Materials and Methods : The water phantom consisted of a scintillation screen (LANEX fast screen, Kodak, USA) that was axially located in the middle of an acrylic cylinder with a diameter of 25 cm. The charge-coupled device (CCD) camera was attached to the phantom In order to capture the visible light from the scintillation screen. To observe the dose distribution In real time, the intensity of the light from the scintillator was converted to a dosage. The isodose contours of the calculations from RTP and those of the measurements using the scintillation screen were compared for the arc therapy and the Intensity modulated radiation therapy (IMRT). Results : The kernel, expressed as a multiplication of two error functions, was obtained in order to correct the sensitivity of the CCD of the camera and the scintillation screen. When comparing the calculated isodose and measured isodose, a discrepancy of less than 8 mm in the high dose region was observed. Conclusion : Using the 2-D dosimetry system, the relationship between the light and the dosage could be found, and real-time verification of the dose distribution was feasible.
Keywords
IMRT (intensity modulated radiation therapy); QA (quality assurance); Scintillation screen; Real time dosimetry;
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1 Chui CS, LoSasso T, Spiroou S. Dose calculation for photon beam with intensity modulation generated by dynamic jaw or multileaf collimations. Med Phys 1994;21:1237-1244   DOI   ScienceOn
2 Yoon SM, Yi BY, Choi EK, Kim JH, Ahn SD, Lee SW. Quality assurance of patients for intensity modulated radiation therapy. J Korean Soc Ther Radiol Oncol 2002;20:81-90
3 Wang X, Spiirou S, LoSasso T, Chui J, Stein CS, Mahan R. Dosimetric verification of intensity-modulated fields. Med Phys 1996;23:317-327   DOI   ScienceOn
4 Low DA, Gerber RL, Sasa Mutic, James A Purdy. Phantoms for IMRT dose distribution measurement and treatment verification. Int J Radiat Oncol Biol Phys 1998;40:1231-1235   DOI   PUBMED   ScienceOn
5 Low DA, Dempsey JF, Venkatesan R, et al. Evaluation of polymer gels and MRI as a 3-D dosimeter for intensitymodulated radiation therapy. Med Phys 1999;26:1542-1551   DOI   ScienceOn
6 Chang J, Megeras GS, Chui CS, Ling CC, Lutz W. Relative profile and dose verification of intensity-modulated radiation therapy. Int J Radiat Oncol Biol Phys 2000;47:231-240   DOI   PUBMED   ScienceOn
7 Vergote K, Deene YD, Claus F, et al. Application of monomer/polymer gel dosimetry to study the effects of tissue inhomogeneities on intensity-modulated radiation therapy (IMRT) dose distributions. Int J Radiat Oncol Biol Phys 2001;49:1451-1460   DOI   ScienceOn
8 Ling CC, Berman C, Chui S, et al. Conformal radiation treatment of prostate cancer using inversely-planned intensity-modulated photon beams produced with dynamicmultileaf collimation. Int J Radiat Oncol Biol Phys 1996;35:721-730   DOI   PUBMED   ScienceOn
9 Paliwal B, Tome W, Richardson S, Makckie TR. A spiral phantom for IMRT and tomography treatment delivery verification. Med Phys 2000;27:2503-2507   DOI   ScienceOn
10 Cho BC, Pack SW, Oh DH, Bae H. Quality assurance for intensity modulated radiation therapy. J Korean Soc Ther Radiol Oncol 2001;19:275-286
11 Bortfeld T, Boyer AL, Schlegel W, Kahler DL, Walden TJ. Realization and verification of three-dimensional conformal radiotherapy with modulated fields. Int J Radiat Oncol Biol Phys 1994;30:899-908   DOI   PUBMED   ScienceOn
12 Ibbott GS, Maryanski MJ, Eastman P, et al. Threedimensional visualization and measurement of conformal dose distributions using magnetic resonance imaging of bang polymer gel dosimeters. Int J Radiat Oncol Biol Phys 1997;38:1097-1103   DOI   PUBMED   ScienceOn
13 Boyer AL, Yu CX. Intensity-modulated radiation therapy with dynamic multileaf collimators. Semin Radiat Oncol 1999;9:48-59   DOI   ScienceOn
14 Li JS, Boyer AL, Ma CM. Verification of IMRT dose distributions using a water beam imaging system. Med Phys 2001;28:2466-2474   DOI   ScienceOn
15 Zhu TC, Ding L, Liu CR, Palta JR, Simon WE, Shi J. Performance evaluation of a diode array for enhanced dynamic wedge dosimetry. Med Phys 1997;24:1173-1190   DOI   ScienceOn