Arbitrary depth slice imaging based on cone beam x-rays multi-angle sampling

2021 ◽  
Vol 16 (04) ◽  
pp. P04014
Author(s):  
X. Xia ◽  
X. Hu ◽  
J. Zhao ◽  
J. Zou
Keyword(s):  
Cone Beam ◽  
X Rays ◽  
Slice Imaging

scholarly journals Patient Knowledge Regarding Radiation Exposure from Orthopaedic Foot and Ankle Imaging

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.

scholarly journals Designing and Fabricating Nano-Structured and Micro-Structured Radiation Shields for Protection against CBCT Exposure

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4371 ◽  
Author(s):  
Kiana Nikeghbal ◽  
Zahra Zamanian ◽  
Shoaleh Shahidi ◽  
Gianrico Spagnuolo ◽  
Parisa Soltani
Keyword(s):  
Computed Tomography ◽  
Weight Ratio ◽  
Dioctyl Phthalate ◽  
Cone Beam ◽  
Linear Attenuation Coefficient ◽  
X Rays ◽  
X Ray ◽  
Nano Material ◽  
Radiation Shields ◽  
Shielding Properties

Researchers have always been interested in finding new and effective materials for protection against radiation. This experimental study aimed to design and fabricate new types of nano-material and micro-material based shields against the ionizing effect of cone beam computed tomography (CBCT) X-rays. To fabricate a flexible prototype, we added dioctyl phthalate (DOP) oil to emulsion polyvinyl chloride (PVC) powder. The paste was mixed and dispersed. Then, nano- and micro-powders of WO3 and Bi2O3 were added to the paste, with the weight ratio of 20% PVC, 20% DOP, and 60% nano- and micro-metals. Using an ultrasonic mixer, the polymer matrix and metals were mixed and a paste with a thick texture was developed. The resultant paste was poured into glass molds and the molds were then heated in an oven. After cooling, the resultant sheets were selected for further experiments. A CBCT unit and dosimeter were used to evaluate the characterization and X-ray shielding properties of the fabricated prototypes. The half-value layers (HVL) for nano-WO3, micro-WO3, nano-Bi2O3, and micro-Bi2O3 were 0.0390, 0.0524, 0.0351, and 0.0374 cm, respectively. In addition, the linear attenuation coefficient (µ) for these materials were 17.77, 13.20, 19.71, and 18.5 cm−1, respectively. The findings indicate that nano-structured samples are more effective in the attenuation of X-ray energy. The nano-structured WO3 prototype was nearly 34% more efficient in attenuating radiation compared to the micro-structured WO3 prototype. This difference in nano- and micro-structured Bi2O3 prototypes was 6.5%.

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

2021 ◽  
Vol 15 ◽  
pp. 275-284
Author(s):  
T. Nouioua ◽  
A. H. Belbachir
Keyword(s):  
Work Groups ◽  
Cone Beam Ct ◽  
Computation Time ◽  
Daily Practice ◽  
Cone Beam ◽  
X Rays ◽  
Heterogeneous Architectures ◽  
Fdk Algorithm ◽  
3D Volume ◽  
Real Challenge

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.

Patient Knowledge Regarding Radiation Exposure From Foot and Ankle Imaging

2019 ◽  
Vol 13 (4) ◽  
pp. 324-329 ◽  
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

Typical errors when performing intraoral periapical x-rays, and their effect on image quality

2020 ◽  
pp. 36-44
Author(s):  
A.P. Arzhantsev
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Digital Image ◽  
Cone Beam ◽  
X Rays ◽  
Post Processing ◽  
X Ray ◽  
Selection Of ◽  
Periapical Radiography

During the study, intraoral periapical images were analyzed in 300 patients. The possibilities of using the methods of radiography and their influence on the quality of the obtained x-ray images were studied. The intraoral periapical radiography was compared with the results of orthopantomography and cone beam computed tomography. To identify the features of the mapping of zones of periapical destruction, 47 experimental x-ray studies were performed on skeletonized jaws with artificial defects in cortical plates. Often encountered errors are: an arbitrary choice of angles of inclination and the centration of the x-ray tube, the wrong location of the x-ray receiver in the patient's mouth, inaccurate installation or poor fixation of the patient's head, inefficient selection of physical and technical conditions of shooting, non-compliance with the conditions of the photo process with analog radiography or post-processing and printing digital image. The characteristic projection distortions of images resulting from these errors are analyzed and illustrated.

scholarly journals Improving CT-number Accuracy of Dental Cone-beam CT by Correcting Scattered X-rays

2010 ◽  
Vol 12 (1) ◽  
pp. 5-12
Author(s):  
Rika Baba ◽  
Ken Ueda ◽  
Norio Inou ◽  
Michihiko Koseki ◽  
Mariko Takahashi ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
X Rays ◽  
Ct Number

Effects of scattered x-rays on monoenergetic cone-beam 3D CT images

1994 ◽  
Author(s):  
Kohji Inoue ◽  
Hitoshi Kanamori ◽  
Chikao Uyama
Keyword(s):  
Ct Images ◽  
Cone Beam ◽  
X Rays ◽  
3D Ct

Effects of scattered x-rays on cone-beam CT images

1994 ◽  
Author(s):  
Kohji Inoue ◽  
Nobuyuki Nakamori ◽  
Hitoshi Kanamori ◽  
Masahiro Endo
Keyword(s):  
Cone Beam Ct ◽  
Ct Images ◽  
Cone Beam ◽  
X Rays

scholarly journals CBCT's Cone Beam Computed Tomography

2014 ◽  
Vol 1 (1) ◽  
pp. 9
Author(s):  
Sahithya Kailash
Keyword(s):  
Computed Tomography ◽  
Panoramic Radiography ◽  
Cone Beam ◽  
X Rays ◽  
Health Issues ◽  
X Ray ◽  
3 Dimensional ◽  
Area Of Interest ◽  
Multiplanar Imaging ◽  
Dimensional Reconstruction

Dental X- Rays are important for diagnosing and treating patients by helping to detect oral health issues when they can't be detected by visual or physical examination alone. Dental X-Ray take a much closer look and provide valuable information in the area of interest. Though 2 Dimensional X-Ray and Panoramic radiography can predict diagnosis in number of clinical cases, certain situations demand multiplanar imaging, one such technology is CBCT. CBCT is a specialised 3Dimensional Craniofacial imaging in which 3 Dimensional reconstruction is possible. The final reconstructed image produced, reveals multilayer images in 3 orthogonal planes (coronal, sagittal and transverse) This article focuses on CBCT and its applications in various fields of dentistry.

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