X-ray symptoms of odontogenic osteonecrosis of jaw, arised under influence of phosphorus-containing compounds

Тhe present article dwells upon the problem of the radiological diagnostics of the odontogenic jaw osteosteonecrosis, typical for the persons with the addiction to the drugs, containing phosphorus. Тhe research of the radiological evidence, typical for the aforesaid ailment is the goal of this article. Тhe patients are divided into 5 groups, the clinical situations are illustrated by radiographs, cone-beam and multispiral computer scans. Тhe signs discovered are applied as a basis for the rational surgical and medication treatment, and make it possible to differentiate between the odontogenic osteomyelitis of the commonplace etiology and desomorphine osteonecrosis as regards the patients with drug addiction.

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SURGICAL EVALUATION OF PANORAMIC X-RAY AND CONE BEAM COMPUTED TOMOGRAPHY FOR THERAPY PLANNING OF BISPHOSPHONATE RELATED OSTEONECROSIS OF THE JAWS

10.26226/morressier.578e3b4bd462b80292381a18 ◽

2016 ◽

Author(s):

Daniel G.E. Thiem

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Therapy Planning ◽

X Ray ◽

Osteonecrosis Of The Jaws ◽

Surgical Evaluation

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A Method to Improve Electron Density Measurement of Cone-Beam CT Using Dual Energy Technique

BioMed Research International ◽

10.1155/2015/858907 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Kuo Men ◽

Jian-Rong Dai ◽

Ming-Hui Li ◽

Xin-Yuan Chen ◽

Ke Zhang ◽

...

Keyword(s):

Electron Density ◽

Cone Beam Ct ◽

Density Measurement ◽

Dual Energy ◽

Cone Beam ◽

Imaging Method ◽

Basis Material ◽

X Ray ◽

Dual Energy Imaging ◽

Set Up

Purpose. To develop a dual energy imaging method to improve the accuracy of electron density measurement with a cone-beam CT (CBCT) device.Materials and Methods. The imaging system is the XVI CBCT system on Elekta Synergy linac. Projection data were acquired with the high and low energy X-ray, respectively, to set up a basis material decomposition model. Virtual phantom simulation and phantoms experiments were carried out for quantitative evaluation of the method. Phantoms were also scanned twice with the high and low energy X-ray, respectively. The data were decomposed into projections of the two basis material coefficients according to the model set up earlier. The two sets of decomposed projections were used to reconstruct CBCT images of the basis material coefficients. Then, the images of electron densities were calculated with these CBCT images.Results. The difference between the calculated and theoretical values was within 2% and the correlation coefficient of them was about 1.0. The dual energy imaging method obtained more accurate electron density values and reduced the beam hardening artifacts obviously.Conclusion. A novel dual energy CBCT imaging method to calculate the electron densities was developed. It can acquire more accurate values and provide a platform potentially for dose calculation.

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Half-scan cone-beam X-ray microtomography formula

Scanning ◽

10.1002/sca.4950160406 ◽

2008 ◽

Vol 16 (4) ◽

pp. 216-220 ◽

Cited By ~ 33

Author(s):

G. Wang ◽

Y. Liu ◽

T. H. Lin ◽

P. C. Cheng

Keyword(s):

Cone Beam ◽

X Ray

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Evaluation of an iterative algorithm for three dimensional X-ray cone beam reconstruction

Proceedings of 3rd IEEE International Conference on Image Processing ◽

10.1109/icip.1996.560560 ◽

2002 ◽

Author(s):

J.G. Donaire ◽

J. Roca ◽

I. Garcia

Keyword(s):

Iterative Algorithm ◽

Three Dimensional ◽

Cone Beam ◽

X Ray ◽

Cone Beam Reconstruction

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Phase Contrast Cone Beam Tomography with an X-Ray Grating Interferometer

10.1063/1.3426118 ◽

2010 ◽

Cited By ~ 5

Author(s):

I. Jerjen ◽

V. Revol ◽

C. Kottler ◽

Th. Luethi ◽

U. Sennhauser ◽

...

Keyword(s):

Phase Contrast ◽

Cone Beam ◽

X Ray ◽

Grating Interferometer ◽

Cone Beam Tomography

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A feasibility study of time of flight cone beam computed tomography imaging

Journal of X-Ray Science and Technology ◽

10.3233/xst-210918 ◽

2021 ◽

pp. 1-14

Author(s):

Ignacio O. Romero ◽

Changqing Li

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Time Of Flight ◽

Cone Beam ◽

X Ray ◽

X Ray Scattering ◽

Scattering Effects ◽

Breast Phantom ◽

Scatter Reduction ◽

Strong Scattering

BACKGROUND: The time of flight (TOF) cone beam computed tomography (CBCT) was recently shown to reduce the X-ray scattering effects by 95%and improve the image CNR by 110%for large volume objects. The advancements in X-ray sources like in compact Free Electron Lasers (FEL) and advancements in detector technology show potential for the TOF method to be feasible in CBCT when imaging large objects. OBJECTIVE: To investigate feasibility and efficacy of TOF CBCT in imaging smaller objects with different targets such as bones and tumors embedded inside the background. METHODS: The TOF method used in this work was verified using a 24cm phantom. Then, the GATE software was used to simulate the CBCT imaging of an 8 cm diameter cylindrical water phantom with two bone targets using a modeled 20 keV quasi-energetic FEL source and various TOF resolutions ranging from 1 to 1000 ps. An inhomogeneous breast phantom of similar size with tumor targets was also imaged using the same system setup. RESULTS: The same results were obtained in the 24cm phantom, which validated the applied CBCT simulation approach. For the case of 8cm cylindrical phantom and bone target, a TOF resolution of 10 ps improved the image contrast-to-noise ratio (CNR) by 57%and reduced the scatter-to-primary ratio (SPR) by 8.63. For the case of breast phantom and tumor target, image CNR was enhanced by 12%and SPR was reduced by 1.35 at 5 ps temporal resolution. CONCLUSIONS: This study indicates that a TOF resolution below 10 ps is required to observe notable enhancements in the image quality and scatter reduction for small objects around 8cm in diameter. The strong scattering targets such as bone can result in substantial improvements by using TOF CBCT.

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Automatic Knot Detection in Coarse-Resolution Cone-Beam Computed Tomography Images of Softwood Logs

Forest Products Journal ◽

10.13073/fpj-d-19-00008 ◽

2019 ◽

Vol 69 (3) ◽

pp. 185-187

Author(s):

Magnus Fredriksson ◽

Julie Cool ◽

Stavros Avramidis

Keyword(s):

Computed Tomography ◽

Exploratory Study ◽

Ct Scanning ◽

Detection Algorithm ◽

Cone Beam ◽

X Ray ◽

Coarse Resolution ◽

Computed Tomography Images ◽

X Ray Computed ◽

Accurate Position

Abstract X-ray computed tomography (CT) scanning of sawmill logs is associated with costly and complex machines. An alternative scanning solution was developed, but its data have not been evaluated regarding detection of internal features. In this exploratory study, a knot detection algorithm was applied to images of four logs to evaluate its performance in terms of knot position and size. The results were a detection rate of 67 percent, accurate position, and inaccurate size. Although the sample size was small, it was concluded that automatic knot detection in coarse resolution CT images of softwoods is feasible, albeit for knots of sufficient size.

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MLEM reconstruction with specific initial image for cone-beam x-ray luminescence computed tomography

Medical Imaging 2021: Physics of Medical Imaging ◽

10.1117/12.2580840 ◽

2021 ◽

Author(s):

Jiabin Ruan ◽

Peng Gao ◽

Tianshuai Liu ◽

Yonghua Zhan ◽

Hongbing Lu ◽

...

Keyword(s):

Computed Tomography ◽

Cone Beam ◽

Initial Image ◽

X Ray

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Establishing inherent uncertainty in the shifts determined by volumetric imaging

Journal of Radiotherapy in Practice ◽

10.1017/s1460396917000218 ◽

2017 ◽

Vol 16 (3) ◽

pp. 258-264

Author(s):

Upendra Kumar Giri ◽

Anirudh Pradhan

Keyword(s):

Linear Accelerator ◽

Systematic Errors ◽

Cone Beam ◽

Random Errors ◽

Mean Values ◽

Volumetric Imaging ◽

X Ray ◽

Image Quality Control ◽

The Mean ◽

Six Degree Of Freedom

AbstractObjectiveThis study was conducted for establishing inherent uncertainty in the shift determination by X-ray volumetric imaging (XVI) and calculating margins due to this inherent uncertainty using van Herk formula.Material and methodsThe study was performed on the XVI which was cone-beam computed tomography integrated with the Elekta AxesseTM linear accelerator machine having six degree of freedom enabled HexaPOD couch. Penta-Guide phantom was used for inherent translational and rotational shift determination by repeated imaging. The process was repeated 20 times a day without moving the phantom for 30 consecutive working days. The measured shifts were used for margins calculation using van Herk formula.ResultsThe mean standard deviations were calculated as 0·05, 0·05, 0·06 mm in the three translational (x, y and z) and 0·05°, 0·05°, 0·05° in the three rotational axes (about x, y, z). Paired sample t-test was performed between the mean values of translational shifts (x, y, z) and rotational shifts. The systematic errors were found to be 0·03, 0·04 and 0·03 mm while the random errors were 0·05, 0·06 and 0·06 mm in the lateral, cranio-caudal and anterio-posterior directions, respectively. For the rotational shifts, the systematic errors were 0·02, 0·03 and 0·03 and the random errors were 0·06, 0·05 and 0·05 in the pitch, roll and yaw directions, respectively.ConclusionOur study concluded that there was an inherent uncertainty associated with the XVI tools, on the basis of these six-dimensional shifts, margins were calculated and recorded as a baseline for the quality assurance (QA) programme for XVI imaging tools by checking its reproducibility once in a year or after any major maintenance in hardware or upgradation in software. Although the shift determined was of the order of submillimetre order, still that shift had great significance for the image quality control of the XVI tools. Every departments practicing quality radiotherapy with such imaging tools should establish their own baseline value of inherent shifts and margins during the commissioning and must use an important QA protocol for the tools.

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