Assessment of Digital Chest Radiography Using Stimulable Phosphor

In this pilot study, conventional and digital radiography of the chest was compared in 170 patients. Two digitized radiographs, one frequency modified and one simulating the conventional film-screen combination, and the conventional films were reviewed independently by 5 radiologists with different experience. In spite of the smaller size and lower spatial resolution of the digitized compared with the conventional radiograph, only slight differences were revealed in the observation of different pulmonary and mediastinal changes. Digitized radiography is therefore considered suitable for chest examinations.

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Digital Chest Radiography with a Large Image Intensifier

Acta Radiologica ◽

10.1177/028418518903000401 ◽

1989 ◽

Vol 30 (4) ◽

pp. 337-342 ◽

Cited By ~ 4

Author(s):

L. G. Månsson ◽

S. Kheddache ◽

D. Schlossman ◽

J. Börjesson ◽

E. Håkansson ◽

...

Keyword(s):

Spatial Resolution ◽

Chest Radiography ◽

Image Intensifier ◽

Conventional Technique ◽

Low Contrast ◽

Conventional Film ◽

Digital Chest ◽

Froc Analysis ◽

Screen System ◽

Digital Monitor

A digital system for chest radiography based on a large image intensifier was compared with a conventional film-screen system. The diagnostic performance was evaluated with special reference to the digital monitor images with a modified version of receiver operating characteristic (ROC) analysis—free response ROC (FROC) analysis—on a chest equivalent phantom. Measurements of spatial resolution and energy imparted were also performed. The detectability of low-contrast objects as well as spatial resolution was better for the full-size film-screen radiographs than for both the digital monitor images and the 100 mm photofluorograms. The image-intensifier system has a potential for considerable dose savings in relation to the conventional technique provided that fluoroscopy is excluded in the positioning of the patients.

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Proper Management of the Clinical Exposure Index Based on Body Thickness Using Dose Optimization Tools in Digital Chest Radiography: A Phantom Study

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18105203 ◽

2021 ◽

Vol 18 (10) ◽

pp. 5203

Author(s):

Yongsu Yoon ◽

Hyemin Park ◽

Jungmin Kim ◽

Jungsu Kim ◽

Younghoon Roh ◽

...

Keyword(s):

Digital Radiography ◽

Chest Radiography ◽

Exposure Dose ◽

Dose Optimization ◽

International Electrotechnical Commission ◽

Exposure Condition ◽

Exposure Index ◽

Lateral Projection ◽

Exposure Indicator ◽

Digital Chest

In radiography, the exposure index (EI), as per the International Electrotechnical Commission standard, depends on the incident beam quality and exposure dose to the digital radiography system. Today automatic exposure control (AEC) systems are commonly employed to obtain the optimal image quality. An AEC system can maintain a constant incident exposure dose on the image receptor regardless of the patient thickness. In this study, we investigated the relationship between body thickness, entrance surface dose (ESD), EI, and the exposure indicator (S value) with the aim of using EI as the dose optimization tool in digital chest radiography (posterior–anterior and lateral projection). The exposure condition from the Korean national survey for determining diagnostic reference levels and two digital radiography systems (photostimulable phosphor plate and indirect flat panel detector) were used. As a result, ESD increased as the phantom became thicker with constant exposure indicator, which indicates similar settings to an AEC system, but the EI indicated comparatively constant values without following the tendency of ESD. Therefore, body thickness should be considered under the AEC system for introducing EI as the dose optimization tool in digital chest radiography.

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