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Kisling K, Zhang L, Simonds H, Fakie N, Yang J, McCarroll R, Balter P, Burger H, Bogler O, Howell R, Schmeler K, Mejia M, Beadle BM, Jhingran A, Court L. Fully Automatic Treatment Planning for External-Beam Radiation Therapy of Locally Advanced Cervical Cancer: A Tool for Low-Resource Clinics. J Glob Oncol 2020; 5:1-9. [PMID: 30629457 PMCID: PMC6426517 DOI: 10.1200/jgo.18.00107] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Purpose The purpose of this study was to validate a fully automatic treatment planning system for conventional radiotherapy of cervical cancer. This system was developed to mitigate staff shortages in low-resource clinics. Methods In collaboration with hospitals in South Africa and the United States, we have developed the Radiation Planning Assistant (RPA), which includes algorithms for automating every step of planning: delineating the body contour, detecting the marked isocenter, designing the treatment-beam apertures, and optimizing the beam weights to minimize dose heterogeneity. First, we validated the RPA retrospectively on 150 planning computed tomography (CT) scans. We then tested it remotely on 14 planning CT scans at two South African hospitals. Finally, automatically planned treatment beams were clinically deployed at our institution. Results The automatically and manually delineated body contours agreed well (median mean surface distance, 0.6 mm; range, 0.4 to 1.9 mm). The automatically and manually detected marked isocenters agreed well (mean difference, 1.1 mm; range, 0.1 to 2.9 mm). In validating the automatically designed beam apertures, two physicians, one from our institution and one from a South African partner institution, rated 91% and 88% of plans acceptable for treatment, respectively. The use of automatically optimized beam weights reduced the maximum dose significantly (median, −1.9%; P < .001). Of the 14 plans from South Africa, 100% were rated clinically acceptable. Automatically planned treatment beams have been used for 24 patients with cervical cancer by physicians at our institution, with edits as needed, and its use is ongoing. Conclusion We found that fully automatic treatment planning is effective for cervical cancer radiotherapy and may provide a reliable option for low-resource clinics. Prospective studies are ongoing in the United States and are planned with partner clinics.
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Affiliation(s)
- Kelly Kisling
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Lifei Zhang
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Hannah Simonds
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Nazia Fakie
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Jinzhong Yang
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Rachel McCarroll
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Peter Balter
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Hester Burger
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Oliver Bogler
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Rebecca Howell
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Kathleen Schmeler
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Mike Mejia
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Beth M Beadle
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Anuja Jhingran
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
| | - Laurence Court
- Kelly Kisling, Lifei Zhang, Jinzhong Yang, Rachel McCarroll, Peter Balter, Rebecca Howell, Kathleen Schmeler, Anuja Jhingran, and Laurence Court, The University of Texas MD Anderson Cancer Center, Houston, TX; Hannah Simonds, Stellenbosch University and Tygerberg Hospital; Nazia Fakie and Hester Burger, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa; Oliver Bogler, The University of New Mexico School of Medicine, Albuquerque, NM; Mike Mejia, University of Santo Tomas Hospital, Benavides Cancer Institute, Manila, Philippines; Beth M. Beadle, Stanford University, Stanford, CA
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Cardenas C, Beadle B, Rhee D, McCarroll R, Zhang L, Yang J, Court L. Delivering high-quality head-and-neck low-risk clinical target volumes through a fully-automated artificial intelligence-based approach. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.377] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Rhee DJ, Cardenas CE, Elhalawani H, McCarroll R, Zhang L, Yang J, Garden AS, Peterson CB, Beadle BM, Court LE. Automatic detection of contouring errors using convolutional neural networks. Med Phys 2019; 46:5086-5097. [PMID: 31505046 PMCID: PMC6842055 DOI: 10.1002/mp.13814] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/28/2019] [Accepted: 08/30/2019] [Indexed: 12/14/2022] Open
Abstract
PURPOSE To develop a head and neck normal structures autocontouring tool that could be used to automatically detect the errors in autocontours from a clinically validated autocontouring tool. METHODS An autocontouring tool based on convolutional neural networks (CNN) was developed for 16 normal structures of the head and neck and tested to identify the contour errors from a clinically validated multiatlas-based autocontouring system (MACS). The computed tomography (CT) scans and clinical contours from 3495 patients were semiautomatically curated and used to train and validate the CNN-based autocontouring tool. The final accuracy of the tool was evaluated by calculating the Sørensen-Dice similarity coefficients (DSC) and Hausdorff distances between the automatically generated contours and physician-drawn contours on 174 internal and 24 external CT scans. Lastly, the CNN-based tool was evaluated on 60 patients' CT scans to investigate the possibility to detect contouring failures. The contouring failures on these patients were classified as either minor or major errors. The criteria to detect contouring errors were determined by analyzing the DSC between the CNN- and MACS-based contours under two independent scenarios: (a) contours with minor errors are clinically acceptable and (b) contours with minor errors are clinically unacceptable. RESULTS The average DSC and Hausdorff distance of our CNN-based tool was 98.4%/1.23 cm for brain, 89.1%/0.42 cm for eyes, 86.8%/1.28 cm for mandible, 86.4%/0.88 cm for brainstem, 83.4%/0.71 cm for spinal cord, 82.7%/1.37 cm for parotids, 80.7%/1.08 cm for esophagus, 71.7%/0.39 cm for lenses, 68.6%/0.72 for optic nerves, 66.4%/0.46 cm for cochleas, and 40.7%/0.96 cm for optic chiasm. With the error detection tool, the proportions of the clinically unacceptable MACS contours that were correctly detected were 0.99/0.80 on average except for the optic chiasm, when contours with minor errors are clinically acceptable/unacceptable, respectively. The proportions of the clinically acceptable MACS contours that were correctly detected were 0.81/0.60 on average except for the optic chiasm, when contours with minor errors are clinically acceptable/unacceptable, respectively. CONCLUSION Our CNN-based autocontouring tool performed well on both the publically available and the internal datasets. Furthermore, our results show that CNN-based algorithms are able to identify ill-defined contours from a clinically validated and used multiatlas-based autocontouring tool. Therefore, our CNN-based tool can effectively perform automatic verification of MACS contours.
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Affiliation(s)
- Dong Joo Rhee
- The University of Texas Graduate School of Biomedical Sciences at HoustonHoustonTX77030USA
- Department of Radiation PhysicsDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Carlos E. Cardenas
- Department of Radiation PhysicsDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Hesham Elhalawani
- Department of Radiation OncologyDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Rachel McCarroll
- Department of Radiation OncologyThe University of Maryland Medical SystemBaltimoreMD21201USA
| | - Lifei Zhang
- Department of Radiation PhysicsDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Jinzhong Yang
- Department of Radiation PhysicsDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Adam S. Garden
- Department of Radiation OncologyDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Christine B. Peterson
- Department of BiostatisticsDivision of Basic SciencesThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
| | - Beth M. Beadle
- Department of Radiation OncologyStanford University School of MedicineStanfordCA94305USA
| | - Laurence E. Court
- Department of Radiation PhysicsDivision of Radiation OncologyThe University of Texas MD Anderson Cancer CenterHoustonTX77030USA
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Court LE, Kisling K, McCarroll R, Zhang L, Yang J, Simonds H, du Toit M, Trauernicht C, Burger H, Parkes J, Mejia M, Bojador M, Balter P, Branco D, Steinmann A, Baltz G, Gay S, Anderson B, Cardenas C, Jhingran A, Shaitelman S, Bogler O, Schmeller K, Followill D, Howell R, Nelson C, Peterson C, Beadle B. Radiation Planning Assistant - A Streamlined, Fully Automated Radiotherapy Treatment Planning System. J Vis Exp 2018. [PMID: 29708544 PMCID: PMC5933447 DOI: 10.3791/57411] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The Radiation Planning Assistant (RPA) is a system developed for the fully automated creation of radiotherapy treatment plans, including volume-modulated arc therapy (VMAT) plans for patients with head/neck cancer and 4-field box plans for patients with cervical cancer. It is a combination of specially developed in-house software that uses an application programming interface to communicate with a commercial radiotherapy treatment planning system. It also interfaces with a commercial secondary dose verification software. The necessary inputs to the system are a Treatment Plan Order, approved by the radiation oncologist, and a simulation computed tomography (CT) image, approved by the radiographer. The RPA then generates a complete radiotherapy treatment plan. For the cervical cancer treatment plans, no additional user intervention is necessary until the plan is complete. For head/neck treatment plans, after the normal tissue and some of the target structures are automatically delineated on the CT image, the radiation oncologist must review the contours, making edits if necessary. They also delineate the gross tumor volume. The RPA then completes the treatment planning process, creating a VMAT plan. Finally, the completed plan must be reviewed by qualified clinical staff.
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Affiliation(s)
- Laurence E Court
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center;
| | - Kelly Kisling
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Rachel McCarroll
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Lifei Zhang
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Jinzhong Yang
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Hannah Simonds
- Department of Radiation Oncology, Stellenbosch University and Tygerberg Hospital
| | - Monique du Toit
- Department of Radiation Oncology, Stellenbosch University and Tygerberg Hospital
| | - Chris Trauernicht
- Department of Radiation Oncology, Stellenbosch University and Tygerberg Hospital
| | - Hester Burger
- Departments of Radiation Oncology and Medical Physics, Groote Schuur Hospital and University of Cape Town
| | - Jeannette Parkes
- Departments of Radiation Oncology and Medical Physics, Groote Schuur Hospital and University of Cape Town
| | - Mike Mejia
- Department of Radiation Oncology, University of Santo Tomas Hospital, Benavides Cancer Institute
| | - Maureen Bojador
- Department of Radiation Oncology, University of Santo Tomas Hospital, Benavides Cancer Institute
| | - Peter Balter
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Daniela Branco
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Angela Steinmann
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Garrett Baltz
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Skylar Gay
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Brian Anderson
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Carlos Cardenas
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Anuja Jhingran
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center
| | - Simona Shaitelman
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center
| | - Oliver Bogler
- Academic Affairs, University of Texas MD Anderson Cancer Center
| | - Kathleen Schmeller
- Department of Gynecological Oncology and Reproductive Medicine, University of Texas MD Anderson Cancer Center
| | - David Followill
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Rebecca Howell
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Christopher Nelson
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center
| | - Christine Peterson
- Department of Biostatistics, University of Texas MD Anderson Cancer Center
| | - Beth Beadle
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center; Department of Radiation Oncology, Stanford University
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McCarroll R, Youssef B, Beadle B, Bojador M, Cardan R, Famiglietti R, Followill D, Ibbott G, Jhingran A, Trauernicht C, Balter P, Court L. Model for Estimating Power and Downtime Effects on Teletherapy Units in Low-Resource Settings. J Glob Oncol 2017; 3:563-571. [PMID: 29094096 PMCID: PMC5646876 DOI: 10.1200/jgo.2016.005306] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Purpose More than 6,500 megavoltage teletherapy units are needed worldwide, many in low-resource settings. Cobalt-60 units or linear accelerators (linacs) can fill this need. We have evaluated machine performance on the basis of patient throughput to provide insight into machine viability under various conditions in such a way that conclusions can be generalized to a vast array of clinical scenarios. Materials and Methods Data from patient treatment plans, peer-reviewed studies, and international organizations were combined to assess the relative patient throughput of linacs and cobalt-60 units that deliver radiotherapy with standard techniques under various power and maintenance support conditions. Data concerning the frequency and duration of power outages and downtime characteristics of the machines were used to model teletherapy operation in low-resource settings. Results Modeled average daily throughput was decreased for linacs because of lack of power infrastructure and for cobalt-60 units because of limited and decaying source strength. For conformal radiotherapy delivered with multileaf collimators, average daily patient throughput over 8 years of operation was equal for cobalt-60 units and linacs when an average of 1.83 hours of power outage occurred per 10-hour working day. Relative to conformal treatments delivered with multileaf collimators on the respective machines, the use of advanced techniques on linacs decreased throughput between 20% and 32% and, for cobalt machines, the need to manually place blocks reduced throughput up to 37%. Conclusion Our patient throughput data indicate that cobalt-60 units are generally best suited for implementation when machine operation might be 70% or less of total operable time because of power outages or mechanical repair. However, each implementation scenario is unique and requires consideration of all variables affecting implementation.
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Affiliation(s)
- Rachel McCarroll
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Bassem Youssef
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Beth Beadle
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Maureen Bojador
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Rex Cardan
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Robin Famiglietti
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - David Followill
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Geoffrey Ibbott
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Anuja Jhingran
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Christoph Trauernicht
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Peter Balter
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
| | - Laurence Court
- , , , , , , , and , The University of Texas MD Anderson Cancer Center; The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX; , Benavides Cancer Institute, University of Santo Tomas Hospital, Manila, Philippines; , University of Alabama Birmingham, Birmingham, AL; , American University of Beirut Medical Center, Beirut, Lebanon; and , Groote Schuur Hospital, Cape Town, South Africa
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Court L, McCarroll R, Kisling K, Zhang L, Yang J, Simonds H, Du Toit M, Mejia M, Jhingran A, Balter P, Beadle B. PO-0820: Full automation of radiation therapy treatment planning. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31257-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Court L, McCarroll R, Kisling K, Zhang L, Yang J, Jhingran A, Balter P, Simonds H, du Toit M, Mejia M, Beadle B. O20. Full automation of radiation therapy treatment planning. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.07.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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McCarroll R, Beadle B, Yang J, Zhang L, Mejia M, Kisling K, Balter P, Stingo F, Nelson C, Followill D, Court L. TU-H-CAMPUS-JeP1-02: Fully Automatic Verification of Automatically Contoured Normal Tissues in the Head and Neck. Med Phys 2016. [DOI: 10.1118/1.4957670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kisling K, Zhang L, Yang J, Jhingran A, Balter P, McCarroll R, Beadle B, Howell R, Schmeler K, Court L. SU-F-T-423: Automating Treatment Planning for Cervical Cancer in Low- and Middle- Income Countries. Med Phys 2016. [DOI: 10.1118/1.4956608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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McCarroll R, Beadle B, Fullen D, Balter P, Followill D, Stingo F, Yang J, Court L. TU-H-CAMPUS-TeP1-02: Seated Treatment: Setup Uncertainty Comparable to Supine. Med Phys 2016. [DOI: 10.1118/1.4957675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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McCarroll R, Rubinstein A, Kingsley C, Yang J, Yang P, Court L. SU-E-T-463: Quantification of Rotational Variation in Mouse Setup for IGRT. Med Phys 2014. [DOI: 10.1118/1.4888796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Grozdanov TP, McCarroll R. Gerade-ungerade symmetry breaking in HD: Bound states supported by the I′Πg1 outer potential well. J Chem Phys 2008; 128:114317. [DOI: 10.1063/1.2839438] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
The authors investigate the use of absorbing potentials and discrete variable representation grid methods in multichannel time-independent scattering calculations. An exactly solvable, coupled-two-channel problem involving square-well potentials is used to assess the quality of numerical results. Special emphasis is given to the description of scattering resonances and near-threshold regions. Numerical treatment of close vicinities of thresholds requires the introduction of nonequidistant grids through a mapping procedure of the scattering coordinate.
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Affiliation(s)
- T P Grozdanov
- Institute of Physics, P.O. Box 57, 11001 Belgrade, Serbia
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Grozdanov TP, Andric L, McCarroll R. Calculations of partial cross sections for photofragmentation processes using complex absorbing potentials. J Chem Phys 2006; 124:94303. [PMID: 16526853 DOI: 10.1063/1.2174014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the use of complex absorbing potentials for the calculation of partial cross sections in multichannel photofragmentation processes. An exactly solvable, coupled-two-channel problem involving square-well potentials is used to compare the performance of various types of absorbing potentials. Special emphasis is given to the near-threshold regions and the conditions under which the numerical results are able to reproduce the Wigner threshold laws. It was found that singular, transmission-free absorbing potentials perform better than those of power or polynomial form.
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Affiliation(s)
- T P Grozdanov
- Institute of Physics, P.O. Box 57, 11001 Belgrade, Serbia and Montenegro.
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Bouakline F, Grozdanov TP, Andric L, McCarroll R. Calculations of near-threshold cross sections for photodissociation of CH+ using the Lanczos algorithm. J Chem Phys 2005; 122:44108. [PMID: 15740236 DOI: 10.1063/1.1836760] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We combine the Lanczos algorithm with the absorbing-potential method, implemented in a discrete variable representation to calculate the near-threshold photodissociation cross sections of CH+. The method is iterative, based on a continued fraction representation of the Green function and avoids any explicit matrix diagonalization. A very good agreement is found with experiment and close-coupling calculations.
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Affiliation(s)
- F Bouakline
- Laboratoire de Chimie Physique-Matière et Rayonnement (UMR 7614 du CNRS), Université Pierre et Marie Curie, 75231-Paris Cedex 05, France
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Dalgarno A, McCarroll R. Properties of the Hydrogen Molecular Ion VII: Magnetic Dipole Oscillator Strengths of the 1s g-3d gTransition. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0370-1298/70/7/304] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Baccarelli I, Andric L, Grozdanov TP, McCarroll R. Comparison of various L2 methods for calculations of radiative association cross sections: Application to collisions of Li with H+. J Chem Phys 2002. [DOI: 10.1063/1.1492277] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Masnou-Seeuws F, McCarroll R. Use of Hund's coupling scheme in the theory of fine structure transitions in atom-atom collisions: application to Na(3p)-He collisions. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/7/16/020] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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McCarroll R, Piacentini RD. Rotational coupling effects on the differential elastic and inelastic cross sections He+-He collisions. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/4/8/007] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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McCarroll R, Piacentini RD. Differential cross sections for elastic scattering, resonant charge exchange and excitation in low energy proton-hydrogen collisions. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/3/10/011] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gaussorgues C, Sech CL, Masnou-Seeuws F, McCarroll R, Riera A. Common trajectory methods for the calculation of differential cross sections for inelastic transitions in atom(ion)-atom collisions. II. Application to proton-hydrogen scattering. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/8/2/015] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Gaussorgues C, Sech CL, Masnou-Seeuws F, McCarroll R, Riera A. Common trajectory methods for the calculation of differential cross sections for inelastic transitions in atom(ion)-atom collisions. I. General theory. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/8/2/014] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Belkic D, McCarroll R. Projectile charge dependence of electron-capture cross sections (cosmic rays-interstellar gas interactions). ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/10/10/022] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Valiron P, Gayet R, McCarroll R, Masnou-Seeuws F, Philippe M. Model-potential methods for the calculation of atom-rare-gas interaction: application to the H-He system. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/12/1/014] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
The spindle checkpoint was characterized in meiosis of budding yeast. In the absence of the checkpoint, the frequency of meiosis I missegregation increased with increasing chromosome length, reaching 19% for the longest chromosome. Meiosis I nondisjunction in spindle checkpoint mutants could be prevented by delaying the onset of anaphase. In a recombination-defective mutant (spo11Delta), the checkpoint delays the biochemical events of anaphase I, suggesting that chromosomes that are attached to microtubules but are not under tension can activate the spindle checkpoint. Spindle checkpoint mutants reduce the accuracy of chromosome segregation in meiosis I much more than that in meiosis II, suggesting that checkpoint defects may contribute to Down syndrome.
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Affiliation(s)
- M A Shonn
- Department of Biochemistry and Department of Physiology, University of California, San Francisco, CA 94143-0444, USA
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Soares Barbosa E, McCarroll R, Grozdanov TP, Rosmus P. Cross section calculations for resonance-dominated photodissociation of HCN via the excited Ã1A″ electronic state. Phys Chem Chem Phys 2000. [DOI: 10.1039/b001989p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gargaud M, Hanssen J, McCarroll R, Valiron P. Charge exchange with multiply charged ions at low energies: application to the N3+/H and C4+/H systems. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/14/13/022] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Rassool FV, Le Beau MM, Shen ML, Neilly ME, Espinosa R, Ong ST, Boldog F, Drabkin H, McCarroll R, McKeithan TW. Direct cloning of DNA sequences from the common fragile site region at chromosome band 3p14.2. Genomics 1996; 35:109-17. [PMID: 8661111 DOI: 10.1006/geno.1996.0329] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Despite several lines of evidence suggesting that common chromosomal fragile sites are biologically important as hot spots for recombination, their structure remains unknown. We showed previously that the plasmid pSV2neo preferentially integrates into bands containing fragile sites in cells transfected under conditions of fragile site induction. Here we report the isolation and characterization of the DNA sequences from two such independent integrations into 3p14.2, a common fragile site (FRA3B). These FRA3B region sequences were shown to lie within a 1330-kb YAC, 850A6, approximately 350 kb telomeric of the breakpoint of t(3;8), a constitutional rearrangement. The two integration sites are 10 kb apart, but each integration is associated with a deletion. We have constructed a partial genomic contig of the integration sites and deleted regions spanning approximately 85 kb. Analysis of the DNA sequences immediately surrounding the plasmid integrations revealed no known coding sequences or repeat structures resembling the (CGG)n motif characteristic of the rare fragile sites. In addition, by Southern blotting analysis, none of the phage clones isolated from the FRA3B region were found to contain CGG repeats. Fluorescence in situ hybridization analysis of genomic clones from this contig to metaphase cells induced to express breaks demonstrated hybridization adjoining the chromosome breaks, and occasionally the hybridization signal spanned the break. The results imply that breakage occurs at variable positions within a large region (at least on the order of 85 kb). Together, these data suggest that the structure of FRA3B differs from that of rare fragile sites.
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MESH Headings
- Aphidicolin/pharmacology
- Base Sequence
- Blotting, Southern
- Chromosome Fragile Sites
- Chromosome Fragility
- Chromosome Walking
- Chromosomes, Artificial, Yeast/genetics
- Chromosomes, Human, Pair 3/drug effects
- Chromosomes, Human, Pair 3/genetics
- Cloning, Molecular
- DNA/genetics
- Electrophoresis, Gel, Pulsed-Field
- Enzyme Inhibitors/pharmacology
- Genetic Vectors/genetics
- Humans
- In Situ Hybridization, Fluorescence
- Molecular Sequence Data
- Nucleic Acid Synthesis Inhibitors
- Recombination, Genetic
- Sequence Deletion
- Trinucleotide Repeats
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Affiliation(s)
- F V Rassool
- Section of HematologysolidusOncology, The University of Chicago, Chicago, Illinois, 60637, USA
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Pieksma M, Gargaud M, McCarroll R, Havener CC. Electron-capture cross section at near-thermal collision energies for Si4++D. Phys Rev A 1996; 54:R13-R16. [PMID: 9913568 DOI: 10.1103/physreva.54.r13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Gargaud M, Bacchus‐Montabonel MC, McCarroll R. Charge transfer of O2+ in helium at thermal and low electron volt energies. J Chem Phys 1993. [DOI: 10.1063/1.466048] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dubernet ML, McCarroll R. Rotational state dependence of rate constants for the reaction of ions with asymmetric top molecules at very low temperatures: application to the N+/H2O system. ACTA ACUST UNITED AC 1990. [DOI: 10.1007/bf01437177] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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