Importance of Some Specifications of Heterogeneous Architectures (CPU+GPU) for 3D Cone-Beam-CT Image Reconstruction Using OpenCL

Medical imaging has found an important way for routine daily practice using cone-beam computed tomography to reconstruct a 3D volume image using the Feldkamp-Davis-Kress (FDK) algorithm. This way can minimize the patient’s time exposure to X-rays. However, its implementation is very costly in computation time, which constitutes a handicap problem in practice. For this reason, the use of acceleration methods on GPU becomes a real solution. For the acceleration of the FDK algorithm, we have used the GPU on heterogeneous platforms. To take full advantage of the GPU, we have chosen useful features of the GPUs and, we have launched the acceleration of the reconstruction according to some technical criteria, namely the work-groups and the work-items. We have found that the number of parallel cores, as well as the memory bandwidth, have no effect on runtimes speedup without being rough in the choice of the number of work-items, which represents a real challenge to master in order to be able to divide them efficiently into work-groups according to the device specifications considered as principal difficulties if we do not study technically the GPU as a hardware device. After an optimized implementation using kernels launched optimally on GPU, we have deduced that the high capacities of the devices must be chosen with a rough optimization of the work-items which are divided into several work-groups according to the hardware limitations.

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Patient Knowledge Regarding Radiation Exposure from Orthopaedic Foot and Ankle Imaging

Foot & Ankle Orthopaedics ◽

10.1177/2473011418s00158 ◽

2018 ◽

Vol 3 (3) ◽

pp. 2473011418S0015

Author(s):

Daniel Bohl ◽

Blaine Manning ◽

George Holmes ◽

Simon Lee ◽

Johnny Lin ◽

...

Keyword(s):

Ionizing Radiation ◽

Ct Scan ◽

Radiation Exposure ◽

Cone Beam Ct ◽

Plain Film ◽

Ct Scans ◽

Cone Beam ◽

X Rays ◽

Foot And Ankle ◽

X Ray

Category: Other Introduction/Purpose: Foot and ankle surgeons routinely prescribe diagnostic imaging that exposes patients to potentially harmful ionizing radiation. The purpose of this study is to characterize patients’ knowledge regarding radiation exposure associated with common forms of foot and ankle imaging. Methods: A survey was administered to all new patients prior to their first foot and ankle clinic appointments. Patients were asked to compare the amount of harmful radiation associated with chest x-rays to that associated with various types of foot and ankle imaging. Results were tabulated and compared to actual values of radiation exposure from the published literature. Results: A total of 890 patients were invited to participate, of whom 791 (88.9%) completed the survey. The majority of patients believed that a foot x-ray, an ankle x-ray, a “low dose” CT scan of the foot and ankle (alluding to cone-beam CT), and a traditional CT scan of the foot and ankle all contain similar amounts of harmful ionizing radiation to a chest x-ray (Table 1). This is in contrast to the published literature, which suggests that foot x-rays, ankle x-rays, cone beam CT scans of the foot and ankle, and traditional CT scans of the foot and ankle expose patients to 0.006, 0.006, 0.127, and 0.833 chest x-rays worth of radiation. Conclusion: The results of the present study suggest that patients greatly over-estimate the amount of harmful ionizing radiation associated with plain film and cone-beam CT scans of the foot and ankle. Interestingly, their estimates of radiation associated with traditional CT scans of the foot and ankle were relatively accurate. Results suggest that patients may benefit from increased counseling by surgeons regarding the relatively low risk of radiation exposure associated with plain film and cone-beam CT imaging of the foot and ankle.

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Comparative dimensional study between panoramic X-ray (OPG) and cone beam CT (CBCT)

ARS Medica Tomitana ◽

10.1515/arsm-2016-0033 ◽

2016 ◽

Vol 22 (3) ◽

pp. 196-202 ◽

Cited By ~ 1

Author(s):

Marinela Tonea ◽

Crina Ivanciu ◽

C. Trascu ◽

F.C. Dogioiu ◽

I. Damian ◽

...

Keyword(s):

Cone Beam Ct ◽

Vertical Axis ◽

Daily Practice ◽

Cone Beam ◽

Radiology Department ◽

X Ray ◽

Dental Imaging ◽

Anterior Teeth ◽

Measured Length ◽

Made In

Abstract During daily practice, we find various situations in which the 1/1 correspondence between panoramic x-ray (OPG) and reality seems not to be respected. In the studied literature, there are articles on this subject, but our study was made based on cases in a highly frequented dental imaging clinic in Bucharest. The study was carried out on a number of 24 patients selected from the radiology department. Using Romexis Viewer software, with soft’s specific feature, measurements have been made (in approximately horizontal and approximately vertical axis) in three different areas: anterior, bicuspid and molar. Various results have been obtained, depending on the studied area. CBCT measured length of anterior teeth was higher than that measured on OPG, in the majority of cases. Molar width (mesio-distal distance) parameter variation was very small between OPG and CBCT.

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Patient Knowledge Regarding Radiation Exposure From Foot and Ankle Imaging

Foot & Ankle Specialist ◽

10.1177/1938640019865364 ◽

2019 ◽

Vol 13 (4) ◽

pp. 324-329 ◽

Cited By ~ 1

Author(s):

Blaine T. Manning ◽

Daniel D. Bohl ◽

Alexander J. P. Idarraga ◽

George B. Holmes ◽

Simon Lee ◽

...

Keyword(s):

Ionizing Radiation ◽

Ct Scan ◽

Radiation Exposure ◽

Cone Beam Ct ◽

Private Insurance ◽

Cone Beam ◽

X Rays ◽

Foot And Ankle ◽

X Ray ◽

Imaging Results

Foot and ankle surgeons routinely prescribe diagnostic imaging that exposes patients to potentially harmful ionizing radiation. It is unclear how well patients understand the radiation to which they are exposed. In this study, 946 consecutive new patients were surveyed regarding medical imaging and radiation exposure prior to their first appointment. Respondents compared the amount of radiation associated with chest X-rays (CXRs) with various types of foot and ankle imaging. Results were compared with actual values of radiation exposure from the published literature. Of 946 patients surveyed, 841 (88.9%) participated. Most had private insurance (82.8%) and a bachelor’s degree or higher (60.6%). Most believed that foot X-ray, ankle X-ray, “low dose” foot and ankle computed tomography (CT) scan (alluding to cone-beam CT), and traditional foot and ankle CT scan contain similar amounts of ionizing radiation to CXR. This contradicts the published literature that suggests that the actual exposure to patients is 0.006, 0.006, 0.127, and 0.833 CXR equivalents of radiation, respectively. Of patients who had undergone an X-ray, 55.9% thought about the issue of radiation prior to the study, whereas 46.1% of those undergoing a CT scan considered radiation prior to the exam. Similarly, 35.2% and 27.6% reported their doctor having discussed radiation with them prior to obtaining an X-ray and CT scan, respectively. Patients greatly overestimate the radiation exposure associated with plain film X-rays and cone-beam CT scans of the foot and ankle, and may benefit from increased counseling regarding the relatively low radiation exposure associated with these imaging modalities. Level of Evidence: Level III: Prospective questionnaire

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Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system

10.1117/12.2081342 ◽

2015 ◽

Author(s):

Junhan Park ◽

Changwoo Lee ◽

Jongduk Baek

Keyword(s):

Cone Beam Ct ◽

Cone Beam ◽

Ct System ◽

3D Volume

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GPU-based parallel implementation of FDK algorithm for cone-beam CT

Journal of Computer Applications ◽

10.3724/sp.j.1087.2012.01407 ◽

2013 ◽

Vol 32 (5) ◽

pp. 1407-1410 ◽

Cited By ~ 1

Author(s):

Yu HAN ◽

Bin YAN ◽

Chao-qun YU ◽

Lei LI

Keyword(s):

Parallel Implementation ◽

Cone Beam Ct ◽

Cone Beam ◽

Fdk Algorithm

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Parallel Implementation of Katsevich's FBP Algorithm

International Journal of Biomedical Imaging ◽

10.1155/ijbi/2006/17463 ◽

2006 ◽

Vol 2006 ◽

pp. 1-8 ◽

Cited By ~ 10

Author(s):

Jiansheng Yang ◽

Xiaohu Guo ◽

Qiang Kong ◽

Tie Zhou ◽

Ming Jiang

Keyword(s):

Numerical Experiments ◽

Parallel Implementation ◽

Cone Beam Ct ◽

Computation Time ◽

Cone Beam ◽

Filtered Backprojection ◽

Typical Experiment ◽

Linux Cluster ◽

Parallel Reconstruction ◽

Reconstruction Time

For spiral cone-beam CT, parallel computing is an effective approach to resolving the problem of heavy computation burden. It is well known that the major computation time is spent in the backprojection step for either filtered-backprojection (FBP) or backprojected-filtration (BPF) algorithms. By the cone-beam cover method [1], the backprojection procedure is driven by cone-beam projections, and every cone-beam projection can be backprojected independently. Basing on this fact, we develop a parallel implementation of Katsevich's FBP algorithm. We do all the numerical experiments on a Linux cluster. In one typical experiment, the sequential reconstruction time is 781.3 seconds, while the parallel reconstruction time is 25.7 seconds with 32 processors.

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