The Experts below are selected from a list of 1092 Experts worldwide ranked by ideXlab platform
In-wha Kim - One of the best experts on this subject based on the ideXlab platform.
-
SU‐C‐BRB‐06: Utilizing 3D Scanner and Printer for Dummy Eye‐Shield: Artifact‐Free CT Images of Tungsten Eye‐Shield for Accurate Dose Calculation
Medical Physics, 2015Co-Authors: J.-y. Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
-
su c brb 06 utilizing 3d scanner and printer for dummy Eye Shield artifact free ct images of tungsten Eye Shield for accurate dose calculation
Medical Physics, 2015Co-Authors: J Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
J Lee - One of the best experts on this subject based on the ideXlab platform.
-
SU‐C‐BRB‐06: Utilizing 3D Scanner and Printer for Dummy Eye‐Shield: Artifact‐Free CT Images of Tungsten Eye‐Shield for Accurate Dose Calculation
Medical Physics, 2015Co-Authors: J.-y. Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
-
su c brb 06 utilizing 3d scanner and printer for dummy Eye Shield artifact free ct images of tungsten Eye Shield for accurate dose calculation
Medical Physics, 2015Co-Authors: J Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
Hyunyong Kim - One of the best experts on this subject based on the ideXlab platform.
-
SU‐C‐BRB‐06: Utilizing 3D Scanner and Printer for Dummy Eye‐Shield: Artifact‐Free CT Images of Tungsten Eye‐Shield for Accurate Dose Calculation
Medical Physics, 2015Co-Authors: J.-y. Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
-
su c brb 06 utilizing 3d scanner and printer for dummy Eye Shield artifact free ct images of tungsten Eye Shield for accurate dose calculation
Medical Physics, 2015Co-Authors: J Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
Haijun Song - One of the best experts on this subject based on the ideXlab platform.
-
SU‐E‐T‐08: How Much Dose to the Eyelid Is Reduced by the Backscatter Cap of the Eye Shield From Electron Beam Radiation Therapy?
Medical Physics, 2013Co-Authors: Jason Bond, Haijun SongAbstract:Purpose: The Eye Shield set (tungsten (W) shells of 2 and 3 mm thick and various diameters) that is manufactured by RPD, Albertville, MN is supplied with aluminum backscatter caps of 0.5 and 1 mm thickness. However, existing backscatter reduction data (Weaver et al 1998, IJROBP, 41.1. pg.233) are not sufficient. This study attempts to quantify Eyelid dose vs backscatter cap thickness using MCNP5. Methods: The electron source in MCNP is simplified to be monoenergetic. The simulated PDD is first validated to measured PDD. The Eyelid, Al backscatter cap, tungsten Shield, and Eyeball are stacked along the electron beam direction. Additional cap thickness of 1.5 mm and 2 mm are simulated to increase the thickness range. For comparison, 3 mm thick lead (Pb) Shield is simulated. All dose values are normalized to the dose at dmax without the Eye Shield. Results: Without any Al cap, the Eyelid dose is 123%, 123%, 126% for 2 mm W, 3 mm W, and 3 mm Pb Shields. With a 1 mm Al cap, the Eyelid dose is 112%, 112%, and 114% respectively. With a 2 mm Al cap, the Eyelid dose falls to 105% for all three Shields. The backscattered photon dose component is
-
su e t 08 how much dose to the Eyelid is reduced by the backscatter cap of the Eye Shield from electron beam radiation therapy
Medical Physics, 2013Co-Authors: Jason Bond, Haijun SongAbstract:Purpose: The Eye Shield set (tungsten (W) shells of 2 and 3 mm thick and various diameters) that is manufactured by RPD, Albertville, MN is supplied with aluminum backscatter caps of 0.5 and 1 mm thickness. However, existing backscatter reduction data (Weaver et al 1998, IJROBP, 41.1. pg.233) are not sufficient. This study attempts to quantify Eyelid dose vs backscatter cap thickness using MCNP5. Methods: The electron source in MCNP is simplified to be monoenergetic. The simulated PDD is first validated to measured PDD. The Eyelid, Al backscatter cap, tungsten Shield, and Eyeball are stacked along the electron beam direction. Additional cap thickness of 1.5 mm and 2 mm are simulated to increase the thickness range. For comparison, 3 mm thick lead (Pb) Shield is simulated. All dose values are normalized to the dose at dmax without the Eye Shield. Results: Without any Al cap, the Eyelid dose is 123%, 123%, 126% for 2 mm W, 3 mm W, and 3 mm Pb Shields. With a 1 mm Al cap, the Eyelid dose is 112%, 112%, and 114% respectively. With a 2 mm Al cap, the Eyelid dose falls to 105% for all three Shields. The backscattered photon dose component is <1% for all simulation scenarios so the backscatter dose is dominated by electrons. The transmission through the Shield is <0.8%, suggesting the Shield thickness can be reduced for 6 MeV electrons. Further study is needed for higher electron energy beams. Conclusion: Of practical guidance value: If 110% or less hot spot is desired for Eyelid, the 0.5 mm Al cap is not sufficient for 6 MeV. The 1 mm cap or 1.5 mm (0.5+1 mm) should be considered (while factoring in patient discomfort in using a thick cap).
J.-y. Park - One of the best experts on this subject based on the ideXlab platform.
-
SU‐C‐BRB‐06: Utilizing 3D Scanner and Printer for Dummy Eye‐Shield: Artifact‐Free CT Images of Tungsten Eye‐Shield for Accurate Dose Calculation
Medical Physics, 2015Co-Authors: J.-y. Park, J Lee, Hyunyong Kim, In-wha KimAbstract:Purpose: To evaluate the effect of a tungsten Eye-Shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten Eye-Shield in the STL format. Scanned data was transferred into a 3D printer. A dummy Eye Shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy Eye-Shield placed on the patient’s right Eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 x 15 cm{sup 2} applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy Eye-Shield region to 17000, the real dose distributions below the tungsten Eye-Shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy Eye-Shield region was assigned to the maximum allowable CT numbermore » (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the Eye Shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy Eye-Shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten Shield.« less
