New IQI for Digital Radiography

2007 ◽  
Author(s):  
Masako Mori ◽  
Toshibumi Kashiwa ◽  
Yoshimitsu Aoki
Keyword(s):  
Image Quality ◽  
Digital Radiography ◽  
Image Resolution ◽  
Nuclear Industry ◽  
Pair Type ◽  
Line Pair ◽  
Welded Structures ◽  
Testing Conditions ◽  
Imaging Parameters ◽  
Radiographic Testing

Radiographic Test (RT) has been widely used in industries to detect inner defects of welded structures or any other significant components. Especially in the nuclear industry, film radiography is the dominant and standardized procedure in performing radiographic testing. Lately emphasis is on digital radiography. One of the most serious concerns for digitization is the lack of image resolution standardizing device like resolution gauge which would determine imaging parameters such as modular transfer function (MTF). This paper proposes line pair type image quality indicator (IQI) corresponding to the current IQIs for both hole and wire type. The advantage of this IQI is to enable easier calibration of testing conditions and quantification of digital RT image quality with required MTF that should be clearly defined in the examination procedures. Furthermore, to acquire “resolution-ensured” digital image of existing RT films, we developed line pair type standardization film. Prototypes of line pair type IQI and line pair type standardization film are currently in the validation study and trial implementing process. These results are also reported in this paper.

Digital Image Acquisition Method for Film Based Radiographic Testing

2004 ◽  
Author(s):  
Masako Mori ◽  
Tetsuo Taguchi ◽  
Mikio Takagi ◽  
Yoshimitsu Aoki
Keyword(s):  
Digital Image ◽  
Image Acquisition ◽  
Image Resolution ◽  
Pair Type ◽  
Line Pair ◽  
Current Image ◽  
Radiographic Testing ◽  
Film Images ◽  
Remote Inspection ◽  
Acquisition Method

Radiographic Test (RT) has been widely used in various industries to detect inner defects of weld structures and other significant components. In terms of digitization, although the ASME Boiler and Pressure Vessel Code Section V provides general outlines of digital image acquisition and processing of RT film, it is not widely implemented in industries as medical radiography instruments. One major reason for not being able to drive RT film digitization is that they cannot quantitatively guarantee each RT film and its digital image resolution directly. To solve these bottlenecks, the present paper proposes two things: 1) Line pair type penetrameter corresponding to current image quality indicators (IQIs) for both hole and wire type, which enables us to not only easily guarantee radiographic testing film resolution but also quantify digitalized RT film image resolution [1]; and 2) Line pair type standard film which is used for digitizing “existing RT film” with commonly used imaging scanners. Prototypes of line pair type penetrameters have been developed and prepared for various materials and verified for its applicability to RT digitalization. Also, prototypes of standard film are manufactured and verified that used with scanners, we can get RT film images of which resolution are quantitatively guaranteed. These two new RT film digitizing methodologies enable us to get “resolution guaranteed film images” and “digital inspection.” Furthermore, this will contribute to “remote inspection” where manufacturers, inspectors, customers and government inspectors can share the results of inspection in electronic format and timely confirm them from a remote place.

Digital Image Evaluation Method for Digital Radiography

2010 ◽  
Author(s):  
Masako Mori ◽  
Toshibumi Kashiwa ◽  
Yoshimitsu Aoki
Keyword(s):  
Image Quality ◽  
Digital Radiography ◽  
Digital Image ◽  
Evaluation Method ◽  
Evaluation Criteria ◽  
Modulation Transfer ◽  
Image Evaluation ◽  
Radiographic Testing ◽  
Testing Techniques ◽  
The Common

Digital radiography is becoming one of the common radiographic testing techniques in various industries. However, to apply this new technique to nuclear components, one big issue is how to evaluate the images and ensure that the images have enough quality to be used as inspection record. In film radiography, the IQI, which stands for Image Quality Indicator, have been used to ensure that the films have enough quality to detect any specified defects in the products. In this paper, new alternative IQI that was developed in our previous study for digital radiography to evaluate digital image quality is tested and evaluated. In addition, new image evaluation criteria are also developed and evaluated by calculating MTF, which stands for Modulation Transfer Function, from the IQI images of the products. Finally, the recommended procedures to evaluate radiographic testing image are summarized.

Digital Image Evaluation Method for Digital Radiography

2010 ◽  
Author(s):  
Masako Mori ◽  
Toshibumi Kashiwa ◽  
Yoshimitsu Aoki
Keyword(s):  
Image Quality ◽  
Digital Radiography ◽  
Digital Image ◽  
Evaluation Method ◽  
Evaluation Criteria ◽  
Modulation Transfer ◽  
Image Evaluation ◽  
Radiographic Testing ◽  
Testing Techniques ◽  
The Common

Digital radiography is getting one of the common radiographic testing techniques in various industries now. However, to apply this new technique to nuclear components radiographic testing, one big issue is how we can evaluate and ensure that the taken images have enough image qualities to be used as inspection record. In film radiography, the IQI, which stands for Image Quality Indicator, have been used to ensure that taken films have enough quality to detect any specified defects in the products. So in this paper, new alternative IQI that developed in our previous study for digital radiography to evaluate digital image quality are tested and evaluated. In addition, image evaluation criteria are also developed and evaluated by calculating MTF, which stands for Modulation Transfer Function, from the IQI images taken with the products. Finally, the recommended procedures to evaluate radiographic testing image are summarized.

scholarly journals Image Quality Evaluation of a Digital Radiography System Made in Thailand

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Udomchai Techavipoo ◽  
Nattawut Sinsuebphon ◽  
Sakunrat Prompalit ◽  
Saowapak Thongvigitmanee ◽  
Walita Narkbuakaew ◽  
...  
Keyword(s):  
Image Quality ◽  
Digital Radiography ◽  
Technology Development ◽  
Image Resolution ◽  
Average Score ◽  
Body Parts ◽  
High Contrast ◽  
Low Contrast ◽  
Contrast Image ◽  
Better Than

Background. The National Science and Technology Development Agency (NSTDA) in Thailand researched and prototyped digital radiography systems under the brand name BodiiRay aiming for sustainable development and affordability of medical imaging technology. The image restoration and enhancement were implemented for the systems. Purpose. The image quality of the systems was evaluated using images from phantoms and from healthy volunteers. Methods. The survey phantom images from BodiiRay and other two commercial systems using the exposure settings for the chest, the abdomen, and the extremity were evaluated by three experience observers in terms of the high-contrast image resolution, the low-contrast image detectability, and the grayscale differentiation. The volunteer images of the chests, the abdomens, and the extremities from BodiiRay were evaluated by three specialized radiologists based on visual grading on 5-point scaled questionnaires for the anatomy visibility, the image quality satisfaction, and the diagnosis confidence in using the images. Results. BodiiRay phantom results were similar to those from the commercial systems. The overall performance averaged across the exposure settings showed that BodiiRay was slightly better than Fujifilm FDR Go in the low-contrast detectability ( p = 0.033 ) and in the grayscale differentiation ( p = 0.004 ). It was also slightly better than Siemens YSIO Max in the high-contrast resolution ( p = 0.018 ). The images of chest, pelvis, and hand phantoms illustrated comparable visual quality. For volunteer images, the percentage of the images scored ≥4 ranged from 61% to 99%, 23% to 92%, and 96% to 99% for the chest, abdomen, and extremity images, respectively. The average score ranged from 3.63 to 4.46, 3.18 to 4.21, and 4.41 to 4.51 for the chest, abdomen, and extremity images, respectively. Conclusion. The phantom image results showed the comparability of these systems. The clinical evaluation showed BodiiRay images provided sufficient image qualities for digital radiography of these body parts.

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