- Title
- The first clinical implementation of a real-time six degree of freedom target tracking system during radiation therapy based on Kilovoltage Intrafraction Monitoring (KIM)
- Creator
- Nguyen, Doan Trang; O'Brien, Ricky; Keall, Paul J.; Kim, Jung-Ha; Huang, Chen-Yu; Wilton, Lee; Greer, Peter; Legge, Kimberley; Booth, Jeremy T.; Poulsen, Per Rugaard; Martin, Jarad
- Relation
- Radiotherapy & Oncology Vol. 123, Issue 1, p. 37-42
- Publisher Link
- http://dx.doi.org/10.1016/j.radonc.2017.02.013
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2017
- Description
- Purpose: We present the first clinical implementation of a real-time six-degree of freedom (6DoF) Kilovoltage Intrafraction Monitoring (KIM) system which tracks the cancer target translational and rotational motions during treatment. The method was applied to measure and correct for target motion during stereotactic body radiotherapy (SBRT) for prostate cancer. Methods: Patient: A patient with prostate adenocarcinoma undergoing SBRT with 36.25 Gy, delivered in 5 fractions was enrolled in the study. 6DoF KIM technology: 2D positions of three implanted gold markers in each of the kV images (125 kV, 10 mA at 11 Hz) were acquired continuously during treatment. The 2D → 3D target position estimation was based on a probability distribution function. The 3D → 6DoF target rotation was calculated using an iterative closest point algorithm. The accuracy and precision of the KIM method was measured by comparing the real-time results with kV-MV triangulation. Results: Of the five treatment fractions, KIM was utilised successfully in four fractions. The intrafraction prostate motion resulted in three couch shifts in two fractions when the prostate motion exceeded the pre-set action threshold of 2 mm for more than 5 s. KIM translational accuracy and precision were 0.3 ± 0.6 mm, −0.2 ± 0.3 mm and 0.2 ± 0.7 mm in the Left-Right (LR), Superior-Inferior (SI) and Anterior-Posterior (AP) directions, respectively. The KIM rotational accuracy and precision were 0.8° ± 2.0°, −0.5° ± 3.3° and 0.3° ± 1.6° in the roll, pitch and yaw directions, respectively. Conclusion: This treatment represents, to the best of our knowledge, the first time a cancer patient’s tumour position and rotation have been monitored in real-time during treatment. The 6 DoF KIM system has sub-millimetre accuracy and precision in all three translational axes, and less than 1° accuracy and 4° precision in all three rotational axes.
- Subject
- tumour rotation; tumour translation; tumour motion; intrafraction motion; prostate cancer radiotherapy; prostate SBRT treatment
- Identifier
- http://hdl.handle.net/1959.13/1399569
- Identifier
- uon:34638
- Identifier
- ISSN:0167-8140
- Rights
- © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
- Language
- eng
- Full Text
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