Differences of Radiographic Quality and Exposure Index on Computed Radiography Using Imaging Plate with Different Reading Time Period

Backgroud: Imaging plate (IP) is a storage media on computed radiography (CR). IP that has been exposed and does not process immediately will decrease the latent image exponentially over time and degrade the image quality. Normally, 25% of signal will be lost if IP was scanned at 10 minutes till 8 hours after exposure. So It will decrease the image quality. Image quality is determined by several factors. One of them is the signal-to-noise ratio (SNR). This study aims to determine the effect of reading time delay of IP to SNR on CR image.Methods: This research was a quantitative study with an experimental approach. Population of this study was CR digital image with various time delay of IP reading. Samples were 51 digital images of water phantom read by IP reading with time interval was 0 hours, 0.5 hours, 1 hour; 1.5 hour, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours and 8 hours after exposure. Image pixel value and noise was weasured by ImageJ software to determine the value of SNR, then analyzed statistically with the regression test.Results: There was effect of reading time delay to SNR on CR image. Time delay affected 30,5% decreasing of SNR. Generally, time delay of IP reading decrease the SNR. The average decrease was 1.55% of SNR.Conclusion: The decrease of the SNR value was not big enough, only 1.55%. However, it will better when IP read as soon as possible after exposure to reduce the decrease of image quality.

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Kualitas Citra Radiografi Berdasarkan Variasi Jeda Waktu Pembacaan Citra pada Computed Radiography

Jurnal Imejing Diagnostik (JImeD) ◽

10.31983/jimed.v2i1.3171 ◽

2016 ◽

Vol 2 (1) ◽

pp. 134-136

Author(s):

Dartini Dartini ◽

Florentina Yunita Wulandari ◽

Akhmad Haris Sulistiyadi

Keyword(s):

Time Delay ◽

Image Quality ◽

Quantitative Research ◽

Reading Time ◽

Computed Radiography ◽

Average Density ◽

Imaging Plate ◽

Delay Variations ◽

Imaging Plates ◽

Lower Image Quality

Background: Computed Radiography (CR) is imaging processor to digitize an image using imaging plate. Imaging plate can store latent image and should be read as soon as possible to avoid the loss of image quality. The longer storage time the lower image quality. This study aimed to determine the image quality in various image reading time delay.Methods: This iresearch was quantitative research with experimental approach. 5 images were acquired using step wedge as an object with same exposure factors. The imaging plates were read in five different image reading time delay variations (no-delay, 2 hours, 4 hours, 6 hours, and 8 hours after eksposure). Contrast and density of each image were measured using lgM and densitometer. Data were analyzed by comparing lgM, density, and contrast of each image.Result: The result showed that there were difference value in density, contrast, and lgM among no-delay, 2 hours, 4 hours, 6 hours, and 8 hours after eksposure images respectively. The average density were 0,701; 0,776; 0,772; 0,798; 0,791. The image contrast were 0,88; 1,09; 0,88; 1,06; 1,02. The lgM value were 2,42; 2,24; 2,21; 2,20; 2,19.Conclusion: The image quality was decreased over reading time delay, the longer reading time delay the lower image quality. To obtain the best image quality, the imaging plate should be read as soon as possible.

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Image Quality Assessment of Four Different Computed Radiography Systems for NDT Applications

Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium ◽

10.1115/pvp2013-97704 ◽

2013 ◽

Author(s):

Angela Peterzol ◽

Bruno Bader ◽

Julien Banchet ◽

Claire Caperaa ◽

Vivian Didier

Keyword(s):

Image Quality ◽

Image Quality Assessment ◽

Computed Radiography ◽

Conventional Radiography ◽

Performance Comparison ◽

Source Image ◽

Imaging Plate ◽

Performance Limits ◽

Joint Project ◽

Comparison Results

Computed radiography (CR) is a digital radiographic technique, which uses very similar equipment to conventional radiography except that in place of a film to create the latent image, an imaging plate (IP) made of a photostimulable phosphor is used [1]. CR systems are commonly used in medical applications since they have proven reliability over more than two decades. Conversely, the NDT community has discussed the efficacy of film replacement by CR for more than 15 years. Though some standards were introduced in 2005 (ASTM E 2033, CEN EN 14784-2) and others are on the way (PR ISO 17636-2), CR is actually not included within the French RCCM, while the technique is commonly used in US for nuclear applications according to ASME (Section V, article 2). Since 2006, AREVA has been evaluating the performance of CR in comparison to conventional RT in the framework of EN 14784 for the digital part and the RCCM for the conventional part. The objective was to build a technical justification report to eventually support introduction of CR into the RCCM. In 2009 the subject gave rise to collaboration between AREVA NP – NETEC and EDF-CEIDRE, for a joint project to establish performance limits of CR towards EN 14784 specifications and RCCM image quality indicator (IQI) requirements [2]. In this paper, we present performance comparison results of four different CR systems. The measurements were conducted in 2012 and they demonstrate the current state of achievable image quality in CR. The performance has been evaluated for steel with a thickness range of 20÷60 mm using an Iridium 192 gamma source. Image quality has been assessed in terms of EN 462 and ASTM (E 747, E 1742) IQI. The results have been scored considering the PR ISO 17636-2, RCCM 2007, and ASME V-2010. This also permitted comparison among the different standard requirements.

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Implementation of exposure index for optimize image quality and patient dose estimation with computed radiography (a clinical study of adult posteroanterior chest and anteroposterior abdomen radiography)

Journal of Physics Conference Series ◽

10.1088/1742-6596/1153/1/012032 ◽

2019 ◽

Vol 1153 ◽

pp. 012032

Author(s):

Dwi Rochmayanti ◽

Gatot Murti Wibowo ◽

Fatimah ◽

Agung Nugroho Setiawan

Keyword(s):

Clinical Study ◽

Image Quality ◽

Computed Radiography ◽

Patient Dose ◽

Exposure Index ◽

Dose Estimation

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SU-E-I-189: The Clinical Efficacy of the Exposure Index Value in Computed Radiography

Medical Physics ◽

10.1118/1.3611763 ◽

2011 ◽

Vol 38 (6Part7) ◽

pp. 3440-3440

Author(s):

M Butler ◽

M Lewis ◽

L Rainford

Keyword(s):

Clinical Efficacy ◽

Computed Radiography ◽

Exposure Index ◽

Index Value

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SU-E-I-27: Establishing Target Exposure Index Values for Computed Radiography

Medical Physics ◽

10.1118/1.4887975 ◽

2014 ◽

Vol 41 (6Part5) ◽

pp. 136-136

Author(s):

N Murphy ◽

P Tchou ◽

K Belcher ◽

A Scott

Keyword(s):

Computed Radiography ◽

Exposure Index ◽

Target Exposure

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

EPJ Web of Conferences ◽

10.1051/epjconf/201817004021 ◽

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.

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