The Experts below are selected from a list of 11850 Experts worldwide ranked by ideXlab platform
Yutaka Ohsawa - One of the best experts on this subject based on the ideXlab platform.
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A spatiotemporal data management method using inverse differential Script
Lecture Notes in Computer Science, 1999Co-Authors: Yutaka OhsawaAbstract:According to popularization of the geographic information system (GIS), temporal data management has become very important. When GIS is used in daily work, the most frequently accessed data is the present data. Therefore, the access speed for the present data should not be lowered in spatiotemporal data management. Furthermore, the past data should also be able to be restored. This paper proposes a spatiotemporal data management method based on the geographic differential Script File (GDSF) method. This method records changes in maps in the form of a graphical operation with a time print. When old data becomes necessary, the data is restored by applying the GDSF to the current map data. This paper describes a combination method of spatial data structure and the GDSF for expediting the excution of spatial retrieval.
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ER Workshops - A Spatiotemporal Data Management Method Using Inverse Differential Script
Advances in Database Technologies, 1998Co-Authors: Yutaka OhsawaAbstract:According to popularization of the geographic information system (GIS), temporal data management has become very important. When GIS is used in daily work, the most frequently accessed data is the present data. Therefore, the access speed for the present data should not be lowered in spatiotemporal data management. Furthermore, the past data should also be able to be restored. This paper proposes a spatiotemporal data management method based on the geographic differential Script File (GDSF) method. This method records changes in maps in the form of a graphical operation with a time print. When old data becomes necessary, the data is restored by applying the GDSF to the current map data. This paper describes a combination method of spatial data structure and the GDSF for expediting the excution of spatial retrieval.
Radhe Mohan - One of the best experts on this subject based on the ideXlab platform.
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su ff t 87 software tools for transferring treatment plans between two planning systems
Medical Physics, 2005Co-Authors: Xiaodong Zhang, L Dong, Xiaorong Ronald Zhu, R Zein, Jinho Lim, Xin A Wang, M Lii, Y Kang, Michael Gillin, Radhe MohanAbstract:Purpose: There is often a need to transfer treatment plan data from one system to another. However, even when both systems are claimed to be compliant with a standard (e.g., DICOM‐RT), the system‐specific implementations may be incompatible . The purpose of this work is to develop and evaluate tools to seamlessly transfer plans designed on one commercial treatment planning system (TPS) to another TPS and vice versa. Method and materials: Pinnacle and Eclipse are the two TPS used in this study. From Pinnacle to Eclipse, a filter to make the Pinnacle DICOM‐RT plans conform to Eclipse implementation was developed. From Eclipse to Pinnacle, a tool to covert a DICOM‐RT plan File to Pinnacle Script File was developed. To evaluate these tools, ten prostate patients planned and treated using IMRT at our institution were used. The 10 IMRT plans were first transferred from Pinnacle to Eclipse, and the doses of the 10 plans were recalculated on Eclipse. New IMRT plans were designed on Eclipse also. The latter were transferred back to Pinnacle and doses were re‐calculated there. Also, optimal fluence distributions generated on Eclipse were transferred to Pinnacle, and the Pinnacle's leaf sequencer was used to generate new leaf sequences. To evaluate the differences between Pinnacle and Eclipse plans, dose and dose‐volume indices were used. Results: The dosimetric data for the plans transferred to Eclipse from Pinnacle do not differ significantly from the original plans, and vice versa. For plans of similar quality, the ones designed on Eclipse had 56% fewer segments than the plans designed on Pinnacle. The Pinnacle generated 23% more segments than the Eclipse using the same optimized fluence distributions imported from Eclipse. Conclusions: DICOM‐RT implementations are often not complete and, therefore, compatible among different commercial planning systems. Special tools are needed to make the plans interchangeable.
Nikos Papanikolaou - One of the best experts on this subject based on the ideXlab platform.
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SU-E-T-754: A Clinical Software Solution to Produce Composite Dose from multiple Patient Plans and Treatment Planning Software
Medical Physics, 2011Co-Authors: Drosoula Giantsoudi, Nikos PapanikolaouAbstract:Purpose: To develop a software program that accurately calculates the composite planned dose when combination of different modalities and/or radiation treatment plans, produced by the same or different treatment planning systems (TPS), is used for the patient's treatment. Methods: MATLAB programming environment was used to develop an in‐house software that calculates the total dose from a combination of CT‐based treatment plans from the same or different TPS. Through a graphical interface, the software imports up to five DICOM‐RT dose Files, as exported by commercially available software such as Pinnacle or TomoTherapy TPS. Selecting the coordinate system of an input 3D‐dose File as reference, solid body transformations are applied to the rest and necessary dose normalizations are performed for partially treated plans before the full dose is calculated. The produced 3D‐dose is re‐sampled according to user‐defined resolution parameters and exported in binary format, along with a Script File containing necessary resolution and positioning information with reference to the patient's CTimage set. It is then imported into Pinnacle TPS, as a new trial in a previously existing patient's plan, for clinical evaluation. Results: For demonstration purposes, two TomoTherapy treatment plans developed for a prostate case to treat the lymphatics and prostate to 54Gy, followed by a field reduction to the prostate alone for an additional dose of 24Gy, were exported and the composite dose was calculated using our software. Isodose evaluation of the total calculated dose, as displayed in Pinnacle TPS, showed the expected distribution, in very good agreement with the individual plans. Conclusions: An in‐house software was developed for quick and easy calculation and evaluation of composite 3D‐dose for patients previously treated with radiation or undergoing treatment through a combination of different treatment plans. It has been successfully used clinically in our institution for the past six months.
Xiaodong Zhang - One of the best experts on this subject based on the ideXlab platform.
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su ff t 87 software tools for transferring treatment plans between two planning systems
Medical Physics, 2005Co-Authors: Xiaodong Zhang, L Dong, Xiaorong Ronald Zhu, R Zein, Jinho Lim, Xin A Wang, M Lii, Y Kang, Michael Gillin, Radhe MohanAbstract:Purpose: There is often a need to transfer treatment plan data from one system to another. However, even when both systems are claimed to be compliant with a standard (e.g., DICOM‐RT), the system‐specific implementations may be incompatible . The purpose of this work is to develop and evaluate tools to seamlessly transfer plans designed on one commercial treatment planning system (TPS) to another TPS and vice versa. Method and materials: Pinnacle and Eclipse are the two TPS used in this study. From Pinnacle to Eclipse, a filter to make the Pinnacle DICOM‐RT plans conform to Eclipse implementation was developed. From Eclipse to Pinnacle, a tool to covert a DICOM‐RT plan File to Pinnacle Script File was developed. To evaluate these tools, ten prostate patients planned and treated using IMRT at our institution were used. The 10 IMRT plans were first transferred from Pinnacle to Eclipse, and the doses of the 10 plans were recalculated on Eclipse. New IMRT plans were designed on Eclipse also. The latter were transferred back to Pinnacle and doses were re‐calculated there. Also, optimal fluence distributions generated on Eclipse were transferred to Pinnacle, and the Pinnacle's leaf sequencer was used to generate new leaf sequences. To evaluate the differences between Pinnacle and Eclipse plans, dose and dose‐volume indices were used. Results: The dosimetric data for the plans transferred to Eclipse from Pinnacle do not differ significantly from the original plans, and vice versa. For plans of similar quality, the ones designed on Eclipse had 56% fewer segments than the plans designed on Pinnacle. The Pinnacle generated 23% more segments than the Eclipse using the same optimized fluence distributions imported from Eclipse. Conclusions: DICOM‐RT implementations are often not complete and, therefore, compatible among different commercial planning systems. Special tools are needed to make the plans interchangeable.
Drosoula Giantsoudi - One of the best experts on this subject based on the ideXlab platform.
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SU-E-T-754: A Clinical Software Solution to Produce Composite Dose from multiple Patient Plans and Treatment Planning Software
Medical Physics, 2011Co-Authors: Drosoula Giantsoudi, Nikos PapanikolaouAbstract:Purpose: To develop a software program that accurately calculates the composite planned dose when combination of different modalities and/or radiation treatment plans, produced by the same or different treatment planning systems (TPS), is used for the patient's treatment. Methods: MATLAB programming environment was used to develop an in‐house software that calculates the total dose from a combination of CT‐based treatment plans from the same or different TPS. Through a graphical interface, the software imports up to five DICOM‐RT dose Files, as exported by commercially available software such as Pinnacle or TomoTherapy TPS. Selecting the coordinate system of an input 3D‐dose File as reference, solid body transformations are applied to the rest and necessary dose normalizations are performed for partially treated plans before the full dose is calculated. The produced 3D‐dose is re‐sampled according to user‐defined resolution parameters and exported in binary format, along with a Script File containing necessary resolution and positioning information with reference to the patient's CTimage set. It is then imported into Pinnacle TPS, as a new trial in a previously existing patient's plan, for clinical evaluation. Results: For demonstration purposes, two TomoTherapy treatment plans developed for a prostate case to treat the lymphatics and prostate to 54Gy, followed by a field reduction to the prostate alone for an additional dose of 24Gy, were exported and the composite dose was calculated using our software. Isodose evaluation of the total calculated dose, as displayed in Pinnacle TPS, showed the expected distribution, in very good agreement with the individual plans. Conclusions: An in‐house software was developed for quick and easy calculation and evaluation of composite 3D‐dose for patients previously treated with radiation or undergoing treatment through a combination of different treatment plans. It has been successfully used clinically in our institution for the past six months.
