Advanced Multiple Beam Equalization Radiography (AMBER) Combined with Computed Radiography

1993 ◽  
Vol 34 (5) ◽  
pp. 445-449 ◽  
Author(s):  
T. P. W. de Rooy ◽  
J. W. Oestmann ◽  
L. J. Schultze Kool ◽  
H. Vrooman ◽  
F. Buchmann
Keyword(s):  
Dynamic Range ◽  
Computed Radiography ◽  
Hard Copy ◽  
Average Dose ◽  
Lung Field ◽  
Multiple Beam ◽  
Digital Storage ◽  
Radiography System ◽  
Combined Use ◽  
Dose Levels

The combined use of AMBER (Advanced Multiple Beam Equalization Radiography) and a digital storage phosphor (SP) radiography system was evaluated for chest radiography in a pilot study with 4 patients. Four image modes with different dose levels were compared: the SP in combination with an AMBER equalized exposure (SP/AMBER) and 3 nonequalized exposures with dose levels corresponding to the respective calculated AMBER lung dose (SP/lung field dose), the calculated AMBER mediastinal dose (SP/mediastinal dose) and the calculated AMBER average dose (SP/average dose). All image modes were matched for Hurter and Driffield characteristics and subjectively rated according to visibility of details. The improved signal-to-noise (S/N) ratio of SP/AMBER resulted in a better visualization of structures in the mediastinum and the basal lung where SP/lung field dose scored lowest. For the central lung no quality differences were seen between techniques. The compressed dynamic range of the SP/AMBER images was more easily displayed on the hard-copy film. The combination of AMBER with SP radiography promises to overcome the dynamic range limitations of digital displays while, at moderate doses, giving better S/N and image quality than standard SP technique.

SU-FF-T-207: Linac QA Using a Computed Radiography System

2005 ◽  
Vol 32 (6Part9) ◽  
pp. 1997-1997
Author(s):  
Y Cai ◽  
J Chu ◽  
D Bernard ◽  
Z Hu
Keyword(s):  
Computed Radiography ◽  
Radiography System

scholarly journals Performance assessment of imaging plates for the JHR transfer Neutron Imaging System

2018 ◽  
Vol 170 ◽  
pp. 04021
Author(s):  
E. Simon ◽  
P. Guimbal
Keyword(s):  
Performance Assessment ◽  
Dynamic Range ◽  
Imaging System ◽  
Computed Radiography ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
Neutron Imaging ◽  
Imaging Plate ◽  
Intimate Contact ◽  
Imaging Plates

The underwater Neutron Imaging System to be installed in the Jules Horowitz Reactor (JHR-NIS) is based on a transfer method using a neutron activated beta-emitter like Dysprosium. The information stored in the converter is to be offline transferred on a specific imaging system, still to be defined. Solutions are currently under investigation for the JHR-NIS in order to anticipate the disappearance of radiographic films commonly used in these applications. We report here the performance assessment of Computed Radiography imagers (Imaging Plates) performed at LLB/Orphée (CEA Saclay). Several imaging plate types are studied, in one hand in the configuration involving an intimate contact with an activated dysprosium foil converter: Fuji BAS-TR, Fuji UR-1 and Carestream Flex XL Blue imaging plates, and in the other hand by using a prototypal imaging plate doped with dysprosium and thus not needing any contact with a separate converter foil. The results for these imaging plates are compared with those obtained with gadolinium doped imaging plate used in direct neutron imaging (Fuji BAS-ND). The detection performances of the different imagers are compared regarding resolution and noise. The many advantages of using imaging plates over radiographic films (high sensitivity, linear response, high dynamic range) could palliate its lower intrinsic resolution.

scholarly journals Clinical applications of digital angiography with the harmonization function in body interventional radiology

2020 ◽  
Vol 38 (10) ◽  
pp. 922-933
Author(s):  
Hidekatsu Tateishi ◽  
Kazunori Kuroki ◽  
Haruhiko Machida ◽  
Toshihiko Iwamoto ◽  
Toshiya Kariyasu ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Dynamic Range ◽  
Good Alternative ◽  
Motion Artifacts ◽  
Body Motion ◽  
Breath Holding ◽  
Lung Field ◽  
Anatomical Landmarks ◽  
Digital Angiography ◽  
Basic Facts

Abstract Digital subtraction angiography (DSA) is frequently applied in interventional radiology (IR). When DSA is not useful due to misregistration, digital angiography (DA) as an alternative option is used. In DA, the harmonization function (HF) works in real time by harmonizing the distribution of gray steps or reducing the dynamic range; thus, it can compress image gradations, decrease image contrast, and suppress halation artifacts. DA with HF as a good alternative to DSA is clinically advantageous in body IR for generating DSA-like images and simultaneously reducing various motion artifacts and misregistrations caused by patient body motion, poor breath-holding, bowel and ureter peristalsis, and cardiac pulsation as well as halation artifacts often stemming from the lung field. Free-breath DA with HF can improve body IR workflow and decrease the procedure time by reducing the risk of catheter dislocation and using background structures as anatomical landmarks, demonstrating reduced radiation exposure relative to DSA. Thus, HF should be more widely and effectively utilized for appropriate purposes in body IR. This article illustrates the basic facts and principles of HF in DA, and demonstrates clinical advantages and limitations of this function in body IR.

scholarly journals Artifacts in chest radiographs with a third-generation computed radiography system.

1996 ◽  
Vol 166 (3) ◽  
pp. 653-657 ◽  
Author(s):  
J P Volpe ◽  
M L Storto ◽  
K P Andriole ◽  
G Gamsu
Keyword(s):  
Computed Radiography ◽  
Chest Radiographs ◽  
Third Generation ◽  
Radiography System
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