Optimal usage of cone beam computed tomography system with different field of views in image guided radiotherapy (IGRT)

Sresty, Narayana Venkata Naga Madhusudhana; Thogata, Ramanjappa; Raju, Alluri Krishnam; Mallikarjuna, Adavala; Talluri, Anil Kumar; Soubhagya, Bhudevi

doi:10.14319/ijcto.33.4

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…1 Cone beam computed tomography (CBCT) integrated with linear accelerator for patient position verification is one of the major 3 dimensional (3D) methods in image guidance. 2, 3 Image guided radiotherapy (IGRT) is typically performed with the help of different imaging techniques to obtain patient setup information just before the treatment delivery. If the patient is not properly immobilized and placed on the couch, adjustments are made such that the patient can be treated with minimized setup errors.…”

Section: Introductionmentioning

confidence: 99%

A study of X-ray volume imaging system in image guided radiotherapy with variable gantry rotations

Sresty

Alluri

Thogata

et al. 2016

Int J Cancer Ther Oncol

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Purpose: The main purpose of this work is to investigate the optimal usage of X-ray volume imaging (XVI) system in image-guided radiotherapy with different gantry rotations in order to reduce scanning volume. Methods: A total of 60 scans of 16 individual patients with breast and head and neck cancer were used in this study. Full and partial gantry rotations were performed at the same time with same setup on the couch using XVI system by changing the preset information. The reference and localization images were matched with this system. The set up errors were evaluated with XVI software. Results: Variation in translational errors with full and half gantry rotations in breast cases were <2 mm in 86.6% of measurements. Similarly, variations between full and partial gantry rotations in head and neck cases were <1 mm in 95.5% of measurements. Results showed almost similar translational and rotational shifts in both full and partial gantry rotations in the majority of the cases. Conclusion: Based on selected cases in this study, partial rotation of the gantry for acquiring 3D cone beam computerized tomography (CBCT) is very useful option in reducing scanning volume and total treatment time in IGRT. However, the use of partial rotation of the gantry depends on patient thickness and area to be reconstructed to track anatomical changes near to the target.

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Section: Introductionmentioning

confidence: 99%

A study of X-ray volume imaging system in image guided radiotherapy with variable gantry rotations

Sresty

Alluri

Thogata

et al. 2016

Int J Cancer Ther Oncol

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Cone beam computed tomography: An accurate imaging technique in comparison with orthogonal portal imaging in intensity-modulated radiotherapy for prostate cancer

Gurjar

Mutneja

Bagdare

2016

Int J Cancer Ther Oncol

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Original ArticleAbstract Purpose: Various factors cause geometric uncertainties during prostate radiotherapy, including interfractional and intrafractional patient motions, organ motion, and daily setup errors. This may lead to increased normal tissue complications when a high dose to the prostate is administered. More-accurate treatment delivery is possible with daily imaging and localization of the prostate. This study aims to measure the shift of the prostate by using kilovoltage (kV) cone beam computed tomography (CBCT) after position verification by kV orthogonal portal imaging (OPI). Methods: Position verification in 10 patients with prostate cancer was performed by using OPI followed by CBCT before treatment delivery in 25 sessions per patient. In each session, OPI was performed by using an on-board imaging (OBI) system and pelvic bone-to-pelvic bone matching was performed. After applying the noted shift by using OPI, CBCT was performed by using the OBI system and prostate-to-prostate matching was performed. The isocenter shifts along all three translational directions in both techniques were combined into a three-dimensional (3-D) iso-displacement vector (IDV). Results: The mean (SD) IDV (in centimeters) calculated during the 250 imaging sessions was 0.931 (0.598, median 0.825) for OPI and 0.515 (336, median 0.43) for CBCT, p-value was less than 0.0001 which shows extremely statistical significant difference. Conclusion: Even after bone-to-bone matching by using OPI, a significant shift in prostate was observed on CBCT. This study concludes that imaging with CBCT provides a more accurate prostate localization than the OPI technique. Hence, CBCT should be chosen as the preferred imaging technique.

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Optimal usage of cone beam computed tomography system with different field of views in image guided radiotherapy (IGRT)

Cited by 2 publications

References 11 publications

A study of X-ray volume imaging system in image guided radiotherapy with variable gantry rotations

A study of X-ray volume imaging system in image guided radiotherapy with variable gantry rotations

Cone beam computed tomography: An accurate imaging technique in comparison with orthogonal portal imaging in intensity-modulated radiotherapy for prostate cancer

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