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10.1002/acm2.12293 http://scihub22266oqcxt.onion/10.1002/acm2.12293 C5849848!5849848!29479821     free     free     free Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       J+Appl+Clin+Med+Phys 2018 ; 19 (2): 249-57 Nephropedia Template TP {{tp|p=29479821|t=2018. Patient?specific calibration of cone?beam computed tomography data sets for radiotherapy dose calculations and treatment plan assessment |pdf=|usr=}}{{29479821}} gab.com Text Patient specific calibration of cone beam computed tomography data sets for radiotherapy dose calculations and treatment plan assessment JO: J Appl Clin Med Phys http://www.kidney.de/pget.php?&tw=1&pmid=29479821 #FOAvip Purpose: In this work, we propose a new method of calibrating cone beam computed tomography (CBCT) data sets for radiotherapy dose calculation and plan assessment. The motivation for this patient?specific calibration (PSC) method is to develop an efficient, robust, and accurate CBCT calibration process that is less susceptible to deformable image registration (DIR) errors. Methods: Instead of mapping the CT numbers voxel?by?voxel with traditional DIR calibration methods, the PSC methods generates correlation plots between deformably registered planning CT and CBCT voxel values, for each image slice. A linear calibration curve specific to each slice is then obtained by least?squares fitting, and applied to the CBCT slice's voxel values. This allows each CBCT slice to be corrected using DIR without altering the patient geometry through regional DIR errors.A retrospective study was performed on 15 head?and?neck cancer patients, each having routine CBCTs and a middle?of?treatment re?planning CT (reCT). The original treatment plan was re?calculated on the patient's reCT image set (serving as the gold standard) as well as the image sets produced by voxel?to?voxel DIR, density?overriding, and the new PSC calibration methods. Dose accuracy of each calibration method was compared to the reference reCT data set using common dose?volume metrics and 3D gamma analysis. A phantom study was also performed to assess the accuracy of the DIR and PSC CBCT calibration methods compared with planning CT. Results: Compared with the gold standard using reCT, the average dose metric differences were ? 1.1% for all three methods (PSC: ?0.3%; DIR: ?0.7%; density?override: ?1.1%). The average gamma pass rates with thresholds 3%, 3 mm were also similar among the three techniques (PSC: 95.0%; DIR: 96.1%; density?override: 94.4%). Conclusions: An automated patient?specific calibration method was developed which yielded strong dosimetric agreement with the results obtained using a re?planning CT for head?and?neck patients. Twit Text FOAVip Patient specific calibration of cone beam computed tomography data sets for radiotherapy dose calculations and treatment plan assessment ????J Appl Clin Med Phys http://www.kidney.de/pget.php?&tw=1&pmid=29479821 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=29479821 #FOAvip English Wikipedia <ref>{{Cite pmid|29479821}}</ref> Patient?specific calibration of cone?beam computed tomography data sets for radiotherapy dose calculations and treatment plan assessment #MMPMID29479821 MacFarlane M; Wong D; Hoover DA; Wong E; Johnson C; Battista JJ; Chen JZ J Appl Clin Med Phys 2018[Mar]; 19 (2): 249-57 PMID29479821show ga Purpose: In this work, we propose a new method of calibrating cone beam computed tomography (CBCT) data sets for radiotherapy dose calculation and plan assessment. The motivation for this patient?specific calibration (PSC) method is to develop an efficient, robust, and accurate CBCT calibration process that is less susceptible to deformable image registration (DIR) errors. Methods: Instead of mapping the CT numbers voxel?by?voxel with traditional DIR calibration methods, the PSC methods generates correlation plots between deformably registered planning CT and CBCT voxel values, for each image slice. A linear calibration curve specific to each slice is then obtained by least?squares fitting, and applied to the CBCT slice's voxel values. This allows each CBCT slice to be corrected using DIR without altering the patient geometry through regional DIR errors.A retrospective study was performed on 15 head?and?neck cancer patients, each having routine CBCTs and a middle?of?treatment re?planning CT (reCT). The original treatment plan was re?calculated on the patient's reCT image set (serving as the gold standard) as well as the image sets produced by voxel?to?voxel DIR, density?overriding, and the new PSC calibration methods. Dose accuracy of each calibration method was compared to the reference reCT data set using common dose?volume metrics and 3D gamma analysis. A phantom study was also performed to assess the accuracy of the DIR and PSC CBCT calibration methods compared with planning CT. Results: Compared with the gold standard using reCT, the average dose metric differences were ? 1.1% for all three methods (PSC: ?0.3%; DIR: ?0.7%; density?override: ?1.1%). The average gamma pass rates with thresholds 3%, 3 mm were also similar among the three techniques (PSC: 95.0%; DIR: 96.1%; density?override: 94.4%). Conclusions: An automated patient?specific calibration method was developed which yielded strong dosimetric agreement with the results obtained using a re?planning CT for head?and?neck patients. äPatient?specific calibration of cone?beam computed tomography data set(epmc).pdf DeepDyve Pubget Overpricing