<i>Christensen’s Introduction to the Physics of Diagnostic Radiology</i>

Curry, Thomas S.; Dowdey, J. E.; Murry, Robert C.; Cameron, John

doi:10.1119/1.14858

Cited by 224 publications

(311 citation statements)

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“…Yttrium tantalate (YTaO 4 , YTO) and yttrium niobate (YNbO 4 , YNO) are efficient as X-ray phosphors utilized in medical imaging. These phosphors which could be used in electronic detector systems and also in films/screen cassettes, fluoroscopy, tomography, and radiography, may also be induced with lower energy sources such as electrons or ultraviolet (UV) light [3][4][5][6]. Performances of these phosphors are strongly connected with crystalline structure, composition, particle dimensions, and luminescence behaviours.…”

Section: Introductionmentioning

confidence: 99%

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

et al. 2017

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were produced by sol-gel method and grown on single crystalline Si (100) substrate by spin coating approach. Structural properties and thermal behaviours of the films were characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and thermogravimetry and differential thermal analysis (TG-DTA). Systematic Steady-state photoluminescence and lifetime measurements in a series of yttrium niobium-tantalate with varying amounts of Eu 3+ were presented. The photoluminescence spectra of the films exhibited strong blue (380-400 nm) and red (614 nm) emissions upon ultraviolet excitation. Emission intensities were strongly dependent on the host lattice composition and film morphology. 1.5% Eu 3+ doped films exhibited the brightest luminescence and long lifetime extending to 1.22 ms when excited at 254 nm. To the best of our knowledge, this is the first attempt in the production of M′-YTO, M′-YTNO, and M′-YTNO:Eu 3+ films on single crystalline Si (100) substrate via sol-gel spin coating.

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Section: Introductionmentioning

confidence: 99%

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

et al. 2017

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“… (25) The ratio of exposure with the grid to exposure without the grid for chest PA examinations (similar kVp and FFD) are calculated for room 6 and 7. While the Bucky factor is about 3.25 for mid kVp and grid ratio:10 in the references, average of them are about 2.5 for mid kVp and grid ratio:10 in current study (25) . High rate of radiographic reject/repeat observed in this study and previous study that confirmed this results and poor exposure parameters.…”

Section: Discussionmentioning

confidence: 99%

Local reference dose evaluation in conventional radiography examinations in Iran

Shandiz

Toosi

Farsi

et al. 2014

J Applied Clin Med Phys

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The goal of this study was to establish local diagnostic reference levels (LDRLs) for conventional radiography examinations in Sistan‐Baluchestan province of Iran, using dose area product (DAP) measurements followed by a comparison with international dose levels. DAP factor evaluation was carried out at eight radiography rooms in six public and one private health‐care centers. The study employed DAP, exposure, and demographic data (weight, age, height) for 1069 patients who presented for one of the 11 routine radiography examinations: chest (AP, PA, LAT), abdomen (AP), lumbar spine (AP, LAT), pelvis (AP), skull (AP/PA, LAT), and cervical spine (AP, LAT). The data were analyzed statistically and the minimum, median, mean, maximum, and third quartile DAP values were calculated. It was observed that LDRLs for chest PA (0.26 Gy.cm2) and chest LAT (0.66 Gy.cm2) projections were up to 136% and 113% higher, respectively, than their corresponding NRPB 2005 values. Other radiographic procedures had lower recommended reference doses compared with recently recommended national reference doses published in recent NRPB reports and other studies. Wide variations in DAP values and exposure parameters were observed for similar radiographic procedures between patients in different rooms and for different patients in the same room. These and other observations, such as poor radiographic techniques, high rate of radiographic reject/repeat, and lack of modern X‐ray machines and equipment, show that the need to carry out quality assurance programs is critical in Iran.PACS numbers: 87.53.Bn, 87.59.B

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“…The spectral distribution of the beam can be regulated by selecting a material with an appropriate atomic number, density and thickness. 19 Copper has an atomic number of 29 with a k-shell binding energy of 9 keV, making it a good material for removing the lower energy portion of the X-ray spectrum, which contributes most to beam hardening. 19 During the period in which this research was conducted, the filtration of the Planmeca Promax 3D CBVT unit was upgraded by the manufacturer.…”

Section: Methodsmentioning

confidence: 99%

“…19 Copper has an atomic number of 29 with a k-shell binding energy of 9 keV, making it a good material for removing the lower energy portion of the X-ray spectrum, which contributes most to beam hardening. 19 During the period in which this research was conducted, the filtration of the Planmeca Promax 3D CBVT unit was upgraded by the manufacturer. The original filtration system consisted of 2.5 mm of aluminium according to personal communication with Planmeca.…”

Section: Methodsmentioning

confidence: 99%

Characterization and correction of cupping effect artefacts in cone beam CT

Hunter¹,

McDavid

2012

Dentomaxillofacial Radiology

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Objective: The purpose of this study was to demonstrate and correct the cupping effect artefact that occurs owing to the presence of beam hardening and scatter radiation during image acquisition in cone beam CT (CBCT). Methods: A uniform aluminium cylinder (6061) was used to demonstrate the cupping effect artefact on the Planmeca Promax 3D CBCT unit (Planmeca OY, Helsinki, Finland). The cupping effect was studied using a line profile plot of the grey level values using ImageJ software (National Institutes of Health, Bethesda, MD). A hardware-based correction method using copper pre-filtration was used to address this artefact caused by beam hardening and a software-based subtraction algorithm was used to address scatter contamination. Results: The hardware-based correction used to address the effects of beam hardening suppressed the cupping effect artefact but did not eliminate it. The software-based correction used to address the effects of scatter resulted in elimination of the cupping effect artefact. Conclusion: Compensating for the presence of beam hardening and scatter radiation improves grey level uniformity in CBCT.

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Christensen’s Introduction to the Physics of Diagnostic Radiology

Cited by 224 publications

References 0 publications

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Local reference dose evaluation in conventional radiography examinations in Iran

Characterization and correction of cupping effect artefacts in cone beam CT

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