A comparison of computer‐controlled versus manual on‐line patient setup adjustment

Brock, Kristy K.; McShan, Daniel L.; Balter, James M.

doi:10.1120/jacmp.v3i3.2571

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…Adjustments to the patient are most often made from couch movements while a patient is lying in the treatment position. Automated couch movements are preferred as they disturb the patient less, are more efficient and more accurate than manual movements (54).…”

Section: Imaging For Treatmentmentioning

confidence: 99%

Multimodality Image‐Guided Radiotherapy of the Liver

2008

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Summary Technological advances have made it possible for tumoricidal doses of radiation to be delivered to primary and metastatic liver cancers. Computed tomography, magnetic resonance imaging, ultrasound and positron emission tomography are used to help with tumor definition at the time of radiation planning. Specialized imaging techniques are also used for characterization of tumor motion due to breathing at the time of radiation planning. Image‐guided radiation therapy (IGRT), referring to the use of frequent imaging in the treatment position during a course of radiotherapy to localize the tumor prior to or during each treatment, improves accuracy and precision of radiation delivery. IGRT improves the concordance between the delivered doses to the tumor and normal tissues and the planned doses, which should improve our understanding of dose–outcome analyses. IGRT also reduces the volume of normal tissue that needs to be irradiated, and facilitates dose escalation to the tumor, potentially improving tumor control probability and reducing the risk of toxicity. Image registration is required to bring imaging data sets together at the time of radiation planning and also for image guidance at treatment. This study provides an overview of multimodality imaging and IGRT used in liver cancer conformal radiation therapy.

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Section: Imaging For Treatmentmentioning

confidence: 99%

Multimodality Image‐Guided Radiotherapy of the Liver

2008

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“…Court and Dong 162 used a rigid transformation for the correction of tissue displacement. A deformable procedure based on the finite element model (FEM), in which images are described as blocks of elastic materials on which forces apply, was proposed by Bharath et al 163 and Brock et al 164 In this approach, the parameters that control the behavior of the elastic material and are responsible for the conversion of forces into local deformations of the elastic material are Young's elastic modulus and Poisson's ratio. Although powerful, the model has the drawback that values of the elasticity and density constant for various tissues are not readily available and have to be found by a trial and error procedure.…”

Section: Rigid and Deformable Image Registrationmentioning

confidence: 99%

Prostate Dose Escalation by a Innovative Inverse Planning-Driven IMRT

Liu¹

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. se. TASK NUMBER 5f. WORK UNIT NUMBER REPORT DATE PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBERStanford University Stanford, CA 94305-5401 SPONSORING I MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) U.S. Army Medical Research and Materiel CommandFort Detrick, Maryland 21702-5012 SPONSORIMONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENTApproved for Public Release; Distribution Unlimited SUPPLEMENTARY NOTES ABSTRACTWith the development of computer controlled MLC, IMRT now provides unprecedented means to deliver 3D-dose distributions with sub-centimeter resolution. Inverse planning is at the foundation of IMRT and critically determines its success. As practiced now, however, the capacity of IMRT is greatly underutilized because of the inferior performance of the inverse planning systems. Because of the tacit ignorance of intra-structural tradeoff, the IMRT plans generated by these systems for prostate treatment are, at best, sub-optimal and our endeavor of providing the best possible patient care is compromised. We have carried out a systematic study on this unexplored issue and developed innovative techniques to improve prostate IMRT. A number of important milestones have been accomplished, which include (i) established a theoretical infrastructure of spatially non-uniform penalty scheme for inverse planning; (ii) developed method for incorporating existing clinical knowledge into inverse planning; (iii) proposed an electron density mapping technique to improve the quality of conebeam CT (CBCT) images; (iv) established a robust technique for using onboard CBCT for on-treatment IMRT dose validation; (v) improved prostate IMRT beam orientation selection by integrating organ specific EUD. It is expected these tools will greatly facilitate the imaging, planning, delivery, and quality assurance of prostate IMRT. IS. SUBJECT II.RESEARCH AND ACCOMPLISHMENTSThe success of prostate Intensity modulated radiation therapy (IMRT) depends critically on the performance of inverse planning system. As it is practiced now, however, the capacity of I...

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“…Although they can be moved manually or automatically (Bel et al, 2000) in translational direction they have limited accuracy (Brock et al, 2002;Sharpe et al, 2006) with respect to the resolution of the image registration. This is when the need for a more accurate treatment table arose.…”

Section: Inter-fractional Set-up Correction In Six Degrees Of Freedommentioning

confidence: 99%