Optimizing two radioluminescence based quality assurance devices for diagnostic radiology utilizing a simple model

Lindström, Jan; Hulthén, Markus; Carlsson, Gudrun Alm; Sandborg, Michael

doi:10.1117/12.2042921

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…The results have been disclosed and discussed elsewhere (Lindström et al, 2014;paper IV: Lindström et al, 2020b). During the development process of the LISdevice, the phenomenon of focal spot wandering was encountered and to the knowledge of the author, could be quantified for the first time for x-ray diagnostic radiology equipment (Stein, 2012).…”

Section: Functionality Of Devicesmentioning

confidence: 71%

“…The other, is still in its prototype stage (the LIS-method). Both of the devices are described in Paper IV (Lindström et al, 2020b) and in Lindström et al 2014.…”

Section: Radioluminescence Applicationsmentioning

confidence: 99%

“…Opposite Y-axis: pixel address of edge in mm's along sensor entrance plane. Figure fromLindström et al, 2014 and Paper IV: Lindström et al, 2020b.…”

mentioning

confidence: 99%

“…A CT-profile measured with the LIS-prototype. To the right, the calculated centre of the CT-profile in terms of pixel-address from ten consecutive measurements (Lindström et al 2014).…”

mentioning

confidence: 99%

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Radioluminescence : A simple model for fluorescent layers - analysis and applications

Lindström

2021

Linköping University Medical Dissertations

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A phosphor or scintillator is a material that will emit visible light when struck by ionising radiation. In the early days of diagnostic radiology, it was discovered that the radiation dose needed to get an image on a film, could be greatly reduced by inserting a fluorescent layer of a phosphor in direct contact with the film. Thus, introducing the step of converting the ionising radiation to light in a first step. Going forward in time, film has been replaced with photodetectors and there is now a variety of imaging x-ray systems, still based on phosphors and scintillators.PhD Gavin Poludniowski who skilfully brought pieces together and in the process of challenging the LAC-model, made it better than ever. I would also like to thank: My co-authors Medical Physicists Markus Hulthén and Erik Wåhlin who saved me, always in the last minute. My various head(s) at Karolinska University Hospital who finally got me to reach my long-awaited goal of putting my act together in research My co-workers at the department of Medical Physics who patiently listened to whatever academic challenge I was currently wrestling with. Particularly Angeliki, Jörgen and Shahla. I owe you.Last but by no means least; the remains of my family not backing one bit from their support even when theirs and my life was in a turmoil.

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Section: Functionality Of Devicesmentioning

confidence: 71%

“…The other, is still in its prototype stage (the LIS-method). Both of the devices are described in Paper IV (Lindström et al, 2020b) and in Lindström et al 2014.…”

Section: Radioluminescence Applicationsmentioning

confidence: 99%

“…Opposite Y-axis: pixel address of edge in mm's along sensor entrance plane. Figure fromLindström et al, 2014 and Paper IV: Lindström et al, 2020b.…”

mentioning

confidence: 99%

“…A CT-profile measured with the LIS-prototype. To the right, the calculated centre of the CT-profile in terms of pixel-address from ten consecutive measurements (Lindström et al 2014).…”

mentioning

confidence: 99%

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Radioluminescence : A simple model for fluorescent layers - analysis and applications

Lindström

2021

Linköping University Medical Dissertations

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“…A conference proceeding covering early parts of this work was presented in 2014 (SPIE). 9 A similar approach, but for light field edges only, was presented by Bottaro et al (2017). 10 The novel device is based on a one-dimensional Linear Image Sensor (LIS).…”

Section: Introductionmentioning

confidence: 92%

Development and assessment of a quality assurance device for radiation field–light field congruence testing in diagnostic radiology

et al. 2020

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Purpose: Existing methods for checking the light field radiation field congruence on x-ray equipment either do not fully meet the conditions of various quality control standards regarding inherent uncertainty requirements or contain subjective steps, further increasing the uncertainty of the end result. The aim of this work was to develop a method to check the light field radiation field congruence on all x-ray equipment. The result should have a low uncertainty which is accomplished by eliminating most subjective user steps in the method. A secondary aim was to maintain the same level of usability as of comparable methods but still able to store the result.Approach: A new device has been developed where the light field and corresponding radiation field are monitored through measurements of the field edge locations (in total: 2 x 4 edges). The maximum field size location deviation between light field and radiation field in the new method, is constrained by the physical limitations of the sensors used in various versions of the prototype: Linear Image Sensors (LISs) of 25-29 mm active sensor length. The LISs were sensitized to x-rays by applying a phosphor strip of Gd2O2S:Tb covering the light sensor input area. Later prototypes of the completed LIS device also have the option of a Bluetooth (100 m range standard) connection, thus increasing the mobility. Results:The developed device has a special feature of localization a field edge without any prior, subjective, alignment procedure of the user, i.e. the signals produced were processed by software storing the associated field edge profiles, localizing the edges in them, and finally displaying the calculated deviation. The uncertainty in field edge location difference was estimated to be less than 0.1 mm (k=2). The calculated uncertainty is lower than for other, commercially available, methods for light field radiation field congruence also presented in this work. Conclusions:A new method to check the light field radiation field congruence of x-ray systems was developed to improve on the limitations found in existing methods, such as device detector resolution, subjective operator steps or the lack of storing results for later analysis. The development work overcame several challenges including mathematically describing real life edges of light and radiation fields, noise reduction of radiation edges and mapping/quantification of the rarely observed phenomenon of focal spot wandering. The assessment of the new method showed that the listed limitations were overcome, and the aims were accomplished. It is therefore believed that the device can improve the work in quality controls of x-ray systems.

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Optimizing two radioluminescence based quality assurance devices for diagnostic radiology utilizing a simple model

Cited by 2 publications

References 9 publications

Radioluminescence : A simple model for fluorescent layers - analysis and applications

Radioluminescence : A simple model for fluorescent layers - analysis and applications

Development and assessment of a quality assurance device for radiation field–light field congruence testing in diagnostic radiology

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