지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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At present, megavoltage computed tomography (MVCT) is the only method used to correct the position oftomotherapy patients. MVCT produces extra radiation, in addition to the radiation used for treatment, andrepositioning also takes up much of the total treatment time. To address these issues, we suggest the use ofa video image?guided setup (VIGS) system for correcting the position of tomotherapy patients. We developedan in-house program to correct the exact position of patients using two orthogonal images obtained from twovideo cameras installed at 90º and fastened inside the tomotherapy gantry. The system is programmed to makeautomatic registration possible with the use of edge detection of the user-defined region of interest (ROI). Ahead-and-neck patient is then simulated using a humanoid phantom. After taking the computed tomography(CT) image, tomotherapy planning is performed. To mimic a clinical treatment course, we used an immobilizationdevice to position the phantom on the tomotherapy couch and, using MVCT, corrected its position to matchthe one captured when the treatment was planned. Video images of the corrected position were used as referenceimages for the VIGS system. First, the position was repeatedly corrected 10 times using MVCT, and based onthe saved reference video image, the patient position was then corrected 10 times using the VIGS method.
Thereafter, the results of the two correction methods were compared. The results demonstrated that patientpositioning using a video-imaging method (41.7±11.2 seconds) significantly reduces the overall time of the MVCTmethod (420±6 seconds) (p＜0.05). However, there was no meaningful difference in accuracy between the twomethods (x=0.11 mm, y=0.27 mm, z=0.58 mm, p＞0.05). Because VIGS provides a more accurate result andreduces the required time, compared with the MVCT method, it is expected to manage the overall tomotherapytreatment process more efficiently.
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참고문헌 (13)
참고문헌 신청
Chavaudra J / 2001 / Definition of volumes in external radiotherapy: ICRU reports 50 and 62 / Cancer Radiother 5(5):472~478
Mackie TR / 1993 / Tomotherapy: a new concept for the delivery of dynamic conformal radiotherapy / Med Phys 20(6):1709~1719
Mackie TR / 2003 / Image guidance for precise conformal radiotherapy / Int J Radiat Oncol Biol Phys 56(1):89~105
Milliken BD / 1997 / Performance of a video-image-subtraction-based patient positioning system / Int J Radiat Oncol Biol Phys 38(4):855~866
Schoffel PJ / 2007 / Accuracy of a commercial optical 3D surface imaging system for realignment of patients for radiotherapy of the thorax / Phys Med Biol 52(13):3949~3963
Mackie TR / 1993 / Tomotherapy: a new concept for the delivery of dynamic conformal radiotherapy / Med Phys 20(6):1709~1719
Mackie TR / 2003 / Image guidance for precise conformal radiotherapy / Int J Radiat Oncol Biol Phys 56(1):89~105
Milliken BD / 1997 / Performance of a video-image-subtraction-based patient positioning system / Int J Radiat Oncol Biol Phys 38(4):855~866
Schoffel PJ / 2007 / Accuracy of a commercial optical 3D surface imaging system for realignment of patients for radiotherapy of the thorax / Phys Med Biol 52(13):3949~3963
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