선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- In the patient DQA using tomotherapy, the assessment using a cheese phantom and gafchormic EBT2 film is disadvantageous in accurately confirming 3D measurement of dose distribution in the peripheral and target areas. In the assessment using ArcCHECK phantom, however, it is possib le to perform an accurate measurement of peripheral areas of the target and real-time assessment. This can promote more accurate, faster radiotherapy for patients.
- In this study, the absolute and relative dose was evaluated using cheese phantom and ArcCHECK phantom for the assessment of patient DQA in tomotherapy. Following the measurement depending on the size of the target, it confirmed that the error ratio (3%) was within the range of the mean error.
- In addition, the efficient patient DQA should be possible that simple operation and short time for analysis alongside with an accurate ability dose verification. In this study, we performed an assessment accuracy of dose evaluation and necessity of patient DQA using the evaluation of the point dose using ion chamber and the evaluation of the dose using the 3D volume phantom instead of film in radiosurgery with tomotherapy.
- In this study, with regards to the measurement using cheese phantom and ArcCHECK phantom in radiosurgery using the characteristics of rotational radiotherapy, the accuracy and the requirement for the absolute and relative dose evaluation were examined. In the patient DQA using tomotherapy, the assessment using a cheese phantom and gafchormic EBT2 film is disadvantageous in accurately confirming 3D measurement of dose distribution in the peripheral and target areas.
- For evaluation of whether the agreement for point dose evaluation and dose distribution for both phantoms, criteria for acceptance of 3%/3 mm and 2%/2 mm were applied. This was followed by the comparison of the gamma passing ratio of the criteria irradiation volume and the mean irradiated volume for the error measurement. Thus, the percentage of pixels that was lower than the gamma-value of 1 (ɤ %<1) was analyzed (Fig.
- To assess the accuracy in measuring the absolute dose for Cheese phantom and ArcCHECK phantom, each phantom was compared to the values of dose at the same locations as well as measurements obtained from the irradiated volume in the areas where an ion chamber was placed. The measurement using two phantoms was repeatedly performed five times for each volume to validate the reproducibility.
- For the assessment of patient DQA using 3D volume phantom, the tomotherapy (Accuray, Hi ART, USA) was used. To establish the treatment plans for the assessment of patient DQA, the RANDO phantom (Radiology Support Devices, USA) and CT (Light SpeedTMRT16,GE,USA) to set 1.25 mm slice thickness were followed by the image acquisition. The volume of interest (VOI) was drawn with a globular shape which diameter is 0.
- To measure the absolute dose of the phantom, ion chamber (A1SL, Standard Imaging, USA), micro ion chamber (Exradin A16, Standard Imaging, USA) and tomoelectrometer (Standard Imaging, USA) were used. Gafchromic EBT2 film (International specialty products, Wayne, USA) was attached to a cheese phantom for the 2-dimensional evaluation of dose distribution.
- 64 cc. To perform the patient DQA, treatment plans calculated in the RANDO phantom were mapped onto the cheese phantom and ArcCHECK phantom, respectively. This was followed calculation of dose once again (Fig.
대상 데이터
- The evaluation of dose distribution was assessed using gafchromic EBT2 film and ArcCHECK phantom. The passing ratio at 3%/3 mm was 99.
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