Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung
Improving the accuracy and reproducibility during patient positioning is of paramount importance. Hence, the goal of this work is to characterize the aspects of image blurring occurring during carbon target bremsstrahlung portal imaging and to assess the applicability of a deconvolution algorithm. B...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2017-09-01
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| Series: | Current Directions in Biomedical Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/cdbme-2017-0046 |
| _version_ | 1827969124421074944 |
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| author | Lüdeke Sascha Wyrwoll Vanessa Stelljes Tenzin S. Looe Hui Khee Harder Dietrich Poppe Björn |
| author_facet | Lüdeke Sascha Wyrwoll Vanessa Stelljes Tenzin S. Looe Hui Khee Harder Dietrich Poppe Björn |
| author_sort | Lüdeke Sascha |
| collection | DOAJ |
| description | Improving the accuracy and reproducibility during patient positioning is of paramount importance. Hence, the goal of this work is to characterize the aspects of image blurring occurring during carbon target bremsstrahlung portal imaging and to assess the applicability of a deconvolution algorithm. Blurring effects involved in this method of portal imaging are electron scattering inside the EPID, geometric blurring due to the photon source size and photon scattering inside the patient. These effects can all be described by convolutions using as the convolutional kernel a Lorentz function, whose FWHM is 2λ. The λ values measured for these effects range from 0.2 mm to 0.45 mm, and an iterative 2D-deconvolution of carbon target portal images was performed accordingly. A significant decrease in the image blurring of test objects has been achieved and confirmed by analyzing the RMTF. However for clinical images, the deconvolution method is presently faced with the problem of the associated increase of image noise. |
| first_indexed | 2024-04-09T18:33:08Z |
| format | Article |
| id | doaj.art-85be5c7e70fd48a89e23bd15c077e687 |
| institution | Directory Open Access Journal |
| issn | 2364-5504 |
| language | English |
| last_indexed | 2024-04-09T18:33:08Z |
| publishDate | 2017-09-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Current Directions in Biomedical Engineering |
| spelling | doaj.art-85be5c7e70fd48a89e23bd15c077e6872023-04-11T17:07:13ZengDe GruyterCurrent Directions in Biomedical Engineering2364-55042017-09-013222122510.1515/cdbme-2017-0046cdbme-2017-0046Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlungLüdeke Sascha0Wyrwoll Vanessa1Stelljes Tenzin S.2Looe Hui Khee3Harder Dietrich4Poppe Björn5Pius-Hospital Oldenburg, Germany Pius-Hospital Oldenburg, Germany Pius-Hospital Oldenburg, Germany Pius-Hospital Oldenburg, Germany Georg-August-Universität Göttingen, Germany Pius-Hospital Oldenburg, Germany Improving the accuracy and reproducibility during patient positioning is of paramount importance. Hence, the goal of this work is to characterize the aspects of image blurring occurring during carbon target bremsstrahlung portal imaging and to assess the applicability of a deconvolution algorithm. Blurring effects involved in this method of portal imaging are electron scattering inside the EPID, geometric blurring due to the photon source size and photon scattering inside the patient. These effects can all be described by convolutions using as the convolutional kernel a Lorentz function, whose FWHM is 2λ. The λ values measured for these effects range from 0.2 mm to 0.45 mm, and an iterative 2D-deconvolution of carbon target portal images was performed accordingly. A significant decrease in the image blurring of test objects has been achieved and confirmed by analyzing the RMTF. However for clinical images, the deconvolution method is presently faced with the problem of the associated increase of image noise.https://doi.org/10.1515/cdbme-2017-0046epiddeconvolutionportal imagingcarbon targetiterative |
| spellingShingle | Lüdeke Sascha Wyrwoll Vanessa Stelljes Tenzin S. Looe Hui Khee Harder Dietrich Poppe Björn Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung Current Directions in Biomedical Engineering epid deconvolution portal imaging carbon target iterative |
| title | Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung |
| title_full | Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung |
| title_fullStr | Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung |
| title_full_unstemmed | Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung |
| title_short | Determination of EPID convolution kernels for portal imaging using carbon target bremsstrahlung |
| title_sort | determination of epid convolution kernels for portal imaging using carbon target bremsstrahlung |
| topic | epid deconvolution portal imaging carbon target iterative |
| url | https://doi.org/10.1515/cdbme-2017-0046 |
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