Prog Med Phys.  2013 Mar;24(1):1-24.

Guideline for Imaging Dose on Image-Guided Radiation Therapy

• Cho BC
• Huh HD
• Kim JS
• Choi JH
• Kim SH
• Cho KH
• Cho SJ
• Min CK
• Shin DO
• Lee SH
• Park DW
• Kim KB
• Choi SH
• Kim HY
• Ahn WS
• Kim TH
• Han SC

Abstract

As image-guided radiation therapy (IGRT) has been commonly used for more accurate patient setup and monitoring tumor movement during radiation therapy, the necessity for management of imaging dose is increased. However, it has not been an interest issue to radiation therapy communities because the imaging dose is much lower than the therapeutic dose. However, since the cumulative dose from 4DCT and repeated imaging for daily setup verificationin would not be ignorable, appropriate dose management based on ALARA (As Low As Reasonably Achievable) principle is required. In this study, we aimed that (1) survey on imaging equipments and modalities used for IGRT, (2) estimation of IGRT imaging dose depending on treatment types and equipments, (3) collecting data of effective dose on treatment sites from each equipment and imaging protocol, and thus finally provide guideline for imaging dose reduction and optimization.

Keyword

Radiation therapy; Image-guided radiation therapy; Imaging dose; Effective dose

MeSH Terms

Humans
Radiotherapy, Image-Guided

Figure

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  Fig. 1. CTDI 측정 팬텀, 10 cm 연필형 전리함 및 전리계21) 및 CTDI 의미 설명.

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  Fig. 2. 두부 및 체부 CTDI 측정용 팬텀과 연필형 전리함 삽입 위치.

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  Fig. 3. CT검사 결과로 보고, 기록되는 CTDIvol 및 DLP 예.

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  Fig. 4. 치료계획용 투시장치의 촬영조건에 대한 boxplot.

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  Fig. 5. 치료계획용 CT의 촬영조건에 대한 boxplot. 관전압은 120 kVp로 모두 동일하였음.

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  Fig. 6. 치료계획용 CT의 임상선량 현황 boxplot. CTDIvol (a) 및 DLP (b). 2009년 CT 엑스선검사에 환자선량 권고량 식약청 가이드라 인(K-DRL)과 비교하였음.

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  Fig. 7. 치료계획용 CT촬영에 따른 유효선량. 일반 CT (a) 및 4DCT (b).

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  Fig. 8. 영상유도 방사선치료의 장비별, 부위별 영상 선량.

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  Fig. 9. 영상유도 방사선치료의 장비별, 부위별 유효선량.

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  Fig. 10. 영상유도 방사선치료 시나리오 별 누적 유효선량.

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