Evalution of a Flat-panel Detector System

Sato, Masami; Eguchi, Yoichi; Yamada, Kinichi; Kaga, Yuji; Endo, Yutaka; Yamazaki, Tatsuya

doi:10.6009/jjrt.kj00001357400

Nippon Hoshasen Gijutsu Gakkai Zasshi

2001

DOI: 10.6009/jjrt.kj00001357400

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Evalution of a Flat-panel Detector System

Masami Sato

Yoichi Eguchi

Kinichi Yamada

et al.

Abstract: We evaluated the imaging performance of a flat − panel detector digital radiography system (CXDI − 11X − ray Digital Camera ， Canon Inc ，) and a computed radiography system (FCR9000C − HQ ， Fuji Film) ． The charac − teristics of the two detectors and of the overall systems were compared ． This included evaluation and com − parison of the fundamental physical characteristics ， including x − ray response curve ， modulation transfer function (MTF) ， Wiener spectra ， noise − equivalent quanta ， and x − ray tube vo… Show more

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Cited by 9 publications

(2 citation statements)

References 13 publications

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“…Because around 0.8 mAs is frequently used as a typical X-ray-imaging condition in the NICU[8], we did not evaluate the linearity for far lower current-time product (mAs) and corresponding pixel value. The linearity in the lower exposure dose region has been shown in some previous studies[9,10,11], including previous models in the CXDI flat-panel detector series.…”

supporting

confidence: 54%

A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system

Utsunomiya

Monzen

Akimoto

et al. 2012

Radiol Phys Technol

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We investigated the neonatal entrance-surface dose (ESD) and doses of scattered radiation emitted by a digital mobile X-ray system. The system is equipped with a novel flat-panel detector and is used in the neonatal intensive care unit. In the present study, the following three experiments were performed on frequently used X-ray-imaging condition: (1) the digital characteristics of the FPD were evaluated; (2) the ESD to a water-equivalent phantom was measured with a patient skin dosimeter (PSD); and (3) the scattered radiation around the incubator was measured with an ionization chamber survey meter. The digital characteristic curve showed that the system had excellent linearity and that the contrast characteristics were not affected by the tube voltage in the range of 50-110 kV. The ESD was 51-52 μGy with an 8-cm-thick phantom and 33-34 μGy with a 4.5-cm phantom, for one exposure. The doses measured around the incubator were 0.1-0.6 μSv or below measurable limits. Use of the new device demonstrates the potential of reducing the ESD to the patient and operator.

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supporting

confidence: 54%

A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system

Utsunomiya

Monzen

Akimoto

et al. 2012

Radiol Phys Technol

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“…The FPD system does not need an imaging plate and directly changes the X-ray image into digital data by a rare earth fluorescent screen (Gd 2 O 2 S: Tb) and amorphous silicon (a-Si) sensors. This is a so-called "digital X-ray camera" with a 43 cm × 43 cm flat-panel detector that consists of 160 µm × 160 µm a-Si sensors 1) .…”

mentioning

confidence: 99%

A Flat‐Panel Detector Digital Radiography and a Storage Phosphor Computed Radiography: Screening for Pneumoconioses

Takashima

Suganuma

Sakurazawa

et al. 2007

Journal of Occupational Health

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A b s t r a c t : A F l a t -P a n e l D e t e c t o r D i g i t a l Radiography and a Storage Phosphor ComputedWe compared these two techniques with conventional a n a l o g u e c h e s t r a d i o g r a p h ( A R ) a m o n g pneumoconiotic patients and healthy controls. Thirty individuals consisting of 20 silica-exposed ex-workers and 10 healthy controls without occupational exposure to any mineral dust were examined with chest X-ray by AR, SR and FPD. Three occupational physicians, including one NIOSH B reader, assessed the digital and conventional radiographs by the side-by-side method according to the ILO 2000 International Classification of Radiograph of Pneumoconioses (ILO/ ICRP). No significant difference was shown between the subjective film qualities by AR and FPD. Interreader agreement of the profusion of small opacities on radiographs was high in the order of SR (κ=0.64), FPD (κ=0.62), and AR (κ=0.55). The profusions of small opacity for AR and FPD by the 12-point scaled profusion of ILO/ICRP did not show a statistically significant difference, but those for AR and SR showed a significant difference. The areas under the receiver operator curves (ROC) using clinical diagnosis by a pulmonologist as the reference showed no statistically significant difference among the three radiographic techniques. FPD gives image quality as good as that of AR, and it has acceptable agreement with AR in small profusion categories, which consequently assures its application to pneumoconiosis screening. SR showed less profusion than FPD and AR, which can be fixed with image modification. (J Occup Health 2007; 49: 39-45)

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Comparison of a digital flat-panel versus screen–film, photofluorography and storage-phosphor systems by detection of simulated lung adenocarcinoma lesions using hard copy images

Ono

Yoshitake²,

Akahane³

et al. 2005

BJR

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The purpose of this study was to compare hard copy images from a flat-panel detector digital radiography system with conventional radiography, photofluorographic radiography and storage phosphor radiography for the detection of simulated lung adenocarcinoma lesions and also for radiation dose. To test the diagnostic performance of these four systems, the authors used 15 types of lung adenocarcinoma phantom according to Noguchi's classification and an anthropomorphic chest phantom. The visual evaluation of tumour detectability by four radiologists and two general thoracic surgeons was examined with a five-level confidence scale. Lung doses were measured with glass dosemeters for the chest radiology systems under the conditions used by each hospital and centre. Our results indicated that flat-panel detector digital radiography and storage phosphor radiography are not necessarily superior to conventional radiography and photofluorographic radiography for detecting lung adenocarcinomas when only hard copy images are used, and this suggests a need to carefully optimize chest radiography.

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Evalution of a Flat-panel Detector System

Cited by 9 publications

References 13 publications

A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system

A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system

A Flat‐Panel Detector Digital Radiography and a Storage Phosphor Computed Radiography: Screening for Pneumoconioses

Comparison of a digital flat-panel versus screen–film, photofluorography and storage-phosphor systems by detection of simulated lung adenocarcinoma lesions using hard copy images

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