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Lavrova E, Garrett MD, Wang YF, Chin C, Elliston C, Savacool M, Price M, Kachnic LA, Horowitz DP. Adaptive Radiation Therapy: A Review of CT-based Techniques. Radiol Imaging Cancer 2023; 5:e230011. [PMID: 37449917 PMCID: PMC10413297 DOI: 10.1148/rycan.230011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/18/2023] [Accepted: 05/10/2023] [Indexed: 07/18/2023]
Abstract
Adaptive radiation therapy is a feedback process by which imaging information acquired over the course of treatment, such as changes in patient anatomy, can be used to reoptimize the treatment plan, with the end goal of improving target coverage and reducing treatment toxicity. This review describes different types of adaptive radiation therapy and their clinical implementation with a focus on CT-guided online adaptive radiation therapy. Depending on local anatomic changes and clinical context, different anatomic sites and/or disease stages and presentations benefit from different adaptation strategies. Online adaptive radiation therapy, where images acquired in-room before each fraction are used to adjust the treatment plan while the patient remains on the treatment table, has emerged to address unpredictable anatomic changes between treatment fractions. Online treatment adaptation places unique pressures on the radiation therapy workflow, requiring high-quality daily imaging and rapid recontouring, replanning, plan review, and quality assurance. Generating a new plan with every fraction is resource intensive and time sensitive, emphasizing the need for workflow efficiency and clinical resource allocation. Cone-beam CT is widely used for image-guided radiation therapy, so implementing cone-beam CT-guided online adaptive radiation therapy can be easily integrated into the radiation therapy workflow and potentially allow for rapid imaging and replanning. The major challenge of this approach is the reduced image quality due to poor resolution, scatter, and artifacts. Keywords: Adaptive Radiation Therapy, Cone-Beam CT, Organs at Risk, Oncology © RSNA, 2023.
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Affiliation(s)
- Elizaveta Lavrova
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Matthew D. Garrett
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Yi-Fang Wang
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Christine Chin
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Carl Elliston
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Michelle Savacool
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Michael Price
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - Lisa A. Kachnic
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
| | - David P. Horowitz
- From the Department of Radiation Oncology, Columbia University Irving
Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C.,
C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer
Center, New York, NY (C.C., L.A.K., D.P.H.)
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Srivastava S, Painuly NK, Mishra SP, Srivastava K, Singh N, Singh S, Bhatt MLB. Evaluation of Volumetric Doses of Organs at Risk in Carcinoma Cervix Patients with HDR Intracavitary Brachytherapy and Comparison of CT-based and Conventional Plans. J Biomed Phys Eng 2019; 9:603-612. [PMID: 32039090 PMCID: PMC6943852 DOI: 10.31661/jbpe.v0i0.867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Accepted: 12/04/2017] [Indexed: 11/24/2022]
Abstract
Background: Brachytherapy treatment planning in cervix carcinoma patients using two dimensional (2D) orthogonal images provides only point dose estimates while CT-based planning provides volumetric dose assessment helping in understanding the correlation between morbidity and the dose to organs at risk (OARs) and treatment volume.
Objective: Aim of present study is to compare International Commission on Radiation Units and Measurements Report 38 (ICRU 38) reference point doses to OARs with volumetric doses using 2D images and CT images in patients with cervical cancer.
Material and Methods: In this prospective study, 20 patients with cervical cancer stages (IIB-IIIB) were planned for a brachytherapy dose of 7Gy per fraction for three
fractions using 2D image-based treatment plan and CT-based plan. ICRU 38 points for bladder and rectum were identified on both 2D image-based plan
and CT-based plan and doses (DICRU) at these points were compared to the minimum dose to 2cc volume (D2cc) of bladder and rectum receiving the highest dose.
Results: D2cc bladder dose was 1.60 (±0.67) times more than DICRUb bladder dose whereas D2cc rectum dose was 1.13±0.40 times DICRUr. Significant difference
was found between DICRUb and D2cc dose for bladder (p=.0.016) while no significant difference was seen between DICRUr and D2cc dose for rectum (p=0.964).
Conclusion: The study suggests that ICRU 38 point doses are not the true representation of maximum doses to OARs. CT-based treatment planning is more a reliable tool for OAR dose assessment than the conventional 2D radiograph-based plan.
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Affiliation(s)
- S Srivastava
- MSc, Assistant Professor, Department of Radiotherapy, King George's Medical University,Lucknow, Uttar Pradesh, India
| | - N K Painuly
- PhD, Professor of Medical Physics, Department of Radiotherapy King George's Medical University, Lucknow, Uttar Pradesh, India
| | - S P Mishra
- PhD, Senior Scientist, Department of Radiation Oncology Dr. Ram Manohar Lohia Institute of Medical Sciences,Lucknow, Uttar Pradesh India
| | - K Srivastava
- MD, Professor of Radiation Oncology, Department of Radiotherapy King George's Medical University, Lucknow, Uttar Pradesh, India
| | - N Singh
- PhD, Assistant Professor of Medical Physics, Department of Radiotherapy King George's Medical University, Lucknow, Uttar Pradesh, India
| | - S Singh
- MD, Associate Professor of Radiation Oncology, Department of Radiotherapy King George's Medical University, Lucknow, Uttar Pradesh, India
| | - M L B Bhatt
- MD, Vice Chancellor, Professor of Radiation Oncology King George's Medical University, Lucknow, Uttar Pradesh, India
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