The influence of tube voltage, X-ray exposure rate and thickness of filter material on image quality with dual-energy subtraction imaging in chest diagnostics

1992 ◽  
Vol 2 (3) ◽  
pp. 258-263
Author(s):  
R. D. M�ller ◽  
M. Vo� ◽  
V. John ◽  
P. Gocke ◽  
H. Kuhn ◽  
...  
Keyword(s):  
Image Quality ◽  
Filter Material ◽  
Dual Energy ◽  
Exposure Rate ◽  
Tube Voltage ◽  
X Ray ◽  
Energy Subtraction ◽  
Chest Diagnostics ◽  
Subtraction Imaging

scholarly journals Contrast-enhanced dual-energy subtraction imaging using electronic spectrum-splitting and multi-prism x-ray lenses

2008 ◽  
Author(s):  
Erik Fredenberg ◽  
Björn Cederström ◽  
Mats Lundqvist ◽  
Carolina Ribbing ◽  
Magnus Åslund ◽  
...  
Keyword(s):  
Electronic Spectrum ◽  
Dual Energy ◽  
X Ray ◽  
Spectrum Splitting ◽  
Contrast Enhanced ◽  
Energy Subtraction ◽  
Subtraction Imaging

scholarly journals Threshold-dependent iodine imaging and spectral separation in a whole-body photon-counting CT system

2021 ◽  
Author(s):  
S. Sawall ◽  
L. Klein ◽  
E. Wehrse ◽  
L. T. Rotkopf ◽  
C. Amato ◽  
...  
Keyword(s):  
Image Quality ◽  
Photon Counting ◽  
Dual Energy ◽  
Whole Body ◽  
Dual Energy Ct ◽  
Post Mortem ◽  
Tube Voltage ◽  
Spectral Separation ◽  
Dual Source ◽  
Noise Ratio

Abstract Objective To evaluate the dual-energy (DE) performance and spectral separation with respect to iodine imaging in a photon-counting CT (PCCT) and compare it to dual-source CT (DSCT) DE imaging. Methods A semi-anthropomorphic phantom extendable with fat rings equipped with iodine vials is measured in an experimental PCCT. The system comprises a PC detector with two energy bins (20 keV, T) and (T, eU) with threshold T and tube voltage U. Measurements using the PCCT are performed at all available tube voltages (80 to 140 kV) and threshold settings (50–90 keV). Further measurements are performed using a conventional energy-integrating DSCT. Spectral separation is quantified as the relative contrast media ratio R between the energy bins and low/high images. Image noise and dose-normalized contrast-to-noise ratio (CNRD) are evaluated in resulting iodine images. All results are validated in a post-mortem angiography study. Results R of the PC detector varies between 1.2 and 2.6 and increases with higher thresholds and higher tube voltage. Reference R of the EI DSCT is found as 2.20 on average overall phantoms. Maximum CNRD in iodine images is found for T = 60/65/70/70 keV for 80/100/120/140 kV. The highest CNRD of the PCCT is obtained using 140 kV and is decreasing with decreasing tube voltage. All results could be confirmed in the post-mortem angiography study. Conclusion Intrinsically acquired DE data are able to provide iodine images similar to conventional DSCT. However, PCCT thresholds should be chosen with respect to tube voltage to maximize image quality in retrospectively derived image sets. Key Points • Photon-counting CT allows for the computation of iodine images with similar quality compared to conventional dual-source dual-energy CT. • Thresholds should be chosen as a function of the tube voltage to maximize iodine contrast-to-noise ratio in derived image sets. • Image quality of retrospectively computed image sets can be maximized using optimized threshold settings.

scholarly journals Correlation of image quality parameters with tube voltage in X-ray dark-field chest radiography: a phantom study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas P. Sauter ◽  
Jana Andrejewski ◽  
Manuela Frank ◽  
Konstantin Willer ◽  
Julia Herzen ◽  
...  
Keyword(s):  
Image Quality ◽  
Imaging Modality ◽  
Signal Strength ◽  
Dark Field ◽  
Tube Voltage ◽  
X Ray ◽  
Dose Area Product ◽  
Dark Field Imaging ◽  
Field Imaging

AbstractGrating-based X-ray dark-field imaging is a novel imaging modality with enormous technical progress during the last years. It enables the detection of microstructure impairment as in the healthy lung a strong dark-field signal is present due to the high number of air-tissue interfaces. Using the experience from setups for animal imaging, first studies with a human cadaver could be performed recently. Subsequently, the first dark-field scanner for in-vivo chest imaging of humans was developed. In the current study, the optimal tube voltage for dark-field radiography of the thorax in this setup was examined using an anthropomorphic chest phantom. Tube voltages of 50–125 kVp were used while maintaining a constant dose-area-product. The resulting dark-field and attenuation radiographs were evaluated in a reader study as well as objectively in terms of contrast-to-noise ratio and signal strength. We found that the optimum tube voltage for dark-field imaging is 70 kVp as here the most favorable combination of image quality, signal strength, and sharpness is present. At this voltage, a high image quality was perceived in the reader study also for attenuation radiographs, which should be sufficient for routine imaging. The results of this study are fundamental for upcoming patient studies with living humans.

Chest Imaging with Dual-Energy Subtraction Digital Tomosynthesis

1993 ◽  
Vol 34 (4) ◽  
pp. 346-350 ◽  
Author(s):  
S. Sone ◽  
T. Kasuga ◽  
F. Sakai ◽  
H. Hirano ◽  
K. Kubo ◽  
...  
Keyword(s):  
Low Voltage ◽  
Image Data ◽  
Dual Energy ◽  
Processing Unit ◽  
Digital Tomosynthesis ◽  
Chest Imaging ◽  
Layer Height ◽  
Pulmonary Lesions ◽  
X Ray ◽  
Energy Subtraction

Dual-energy subtraction digital tomosynthesis with pulsed X-ray and rapid kV switching was used to examine calcifications in pulmonary lesions. The digital tomosynthesis system used included a conventional fluororadiographic TV unit with linear tomographic capabilities, a high resolution videocamera, and an image processing unit. Low-voltage, high-voltage, and soft tissue subtracted or bone subtracted tomograms of any desired layer height were reconstructed from the image data acquired during a single tomographic swing. Calcifications, as well as their characteristics and distribution in pulmonary lesions, were clearly shown. The images also permitted discrimination of calcifications from dense fibrotic lesions. This technique was effective in demonstrating calcifications together with a solitary mass or disseminated nodules.

scholarly journals Efficiency and reporting confidence analysis of sequential dual-energy subtraction for thoracic x-ray examinations

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Mehmet Can Gezer ◽  
Oktay Algin ◽  
Aytac Durmaz ◽  
Halil Arslan
Keyword(s):  
Dual Energy ◽  
X Ray ◽  
Energy Subtraction

One-shot dual-energy subtraction imaging.

Radiology ◽  
1986 ◽  
Vol 161 (1) ◽  
pp. 271-273 ◽  
Author(s):  
T Ishigaki ◽  
S Sakuma ◽  
Y Horikawa ◽  
M Ikeda ◽  
H Yamaguchi
Keyword(s):  
Dual Energy ◽  
Energy Subtraction ◽  
Subtraction Imaging

Investigation of dual-energy X-ray photon counting using a cadmium telluride detector and two comparators and its application to photon-count energy subtraction

2014 ◽  
Vol 53 (10) ◽  
pp. 102202 ◽  
Author(s):  
Osahiko Hagiwara ◽  
Eiichi Sato ◽  
Manabu Watanabe ◽  
Yuich Sato ◽  
Yasuyuki Oda ◽  
...  
Keyword(s):  
Cadmium Telluride ◽  
Photon Counting ◽  
Dual Energy ◽  
X Ray ◽  
Photon Count ◽  
Energy Subtraction
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