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Abstract

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.

Keywords

Diagnostic radiology,observer performance thorax,radiography,digital receiver operating characteristic curve (ROC)spatial resolution patient exposure

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References

1. Bengtsson

L. G.

Jensen

: Application of the dose limitation systems for radiation protection. Practical implications, p. 489. IAEA Proc. Series, Vienna 1979.

2. Bunch

P. C.

Hamilton

J. F.

Sanderson

J. K.

Simmons

A. H.

: A free response approach to the measurement and characterization of radiographic observer performance. J. Appl. Photogr. Eng. 4 (1978), 166.

3. Carlsson

G. A.

Carlsson

C. A.

Persliden

: Energy imparted to the patient in diagnostic radiology. Calculation of conversion factors for determining of the energy imparted from measurements of the air collision kerma integrated over beam area. Phys. Med. Biol. 29 (1984), 1329.

4. Chakraborty

D. P.

Breatnach

E. S.

Yester

M. V.

Soto

Barnes

G. T.

Fraser

R. G.

: Digital and conventional chest imaging. A modified ROC study of observer performance using simulated nodules. Radiology 158 (1986), 35.

5. Conway

B. J.

Butler

P. F.

, Duff J. E. and coll.: Beam quality independent attenuation phantom for estimating patient exposure from x-ray automatic exposure controlled chest examinations. Med. Phys. 11 (1984), 827.

6. Foley

W. D.

Wilson

C. R.

, Keyes G. S. and coll.: The effect of varying spatial resolution on the detectability of diffuse pulmonary nodules. Radiology 141 (1981), 25.

7. Georgi

Prager

, Busch H. P. and coll.: Einjährige klinische Erfahrungen mit einem 57-cm Bildverstärker in einem Universal-Röntgenarbeitsplatz. Fortschr. Röntgenstr. 142 (1985), 326.

8. Goodenough

D. J.

Rossman

Lusted

L. B.

: Radiographic applications of receiver operating characteristic curves. Radiology 110 (1974), 89.

9. Green

D. M.

Swets

J. A.

: Signal detection theory and psychophysics, p. 401. John Wiley and Sons, New York 1966.

10.

10. Heuck

F. H.

Hoffmann

F. W.

: Bedeutung eines neuen Grossbildverstärkers für die Reihenuntersuchung der Thoraxorgane. Radiologe 24 (1984), 139.

11.

11. Lams

P. M.

Cocklin

M. L.

: Spatial resolution requirements for digital chest radiographs. An ROC study of observer performance in selected cases. Radiology 158 (1986), 11.

12.

12. MacMahon

Vyborny

C. J.

Metz

C. E.

Doi

Sabetti

Solomon

S. L.

: Digital radiography of subtle pulmonary abnormalities. An ROC study of the effect of pixel size on observer performance. Radiology 158 (1986), 21.

13.

13. Manninen

Rytkönen

Soimakallio

Terho

E. O.

Hentunen

: Large-screen image intensifier photofluorography compared with full-size screen film technique in chest radiography. Acta. Radiol. Diagnosis 26 (1985), 525.

14.

14. Metz

C. E.

: Basic principles of ROC analysis. Sem. Nucl. Med. 8 (1978), 283.

15.

15. Metz

C. E.

ROC methodology in radiologic imaging. Invest. Radiol. 21 (1986), 720.

16.

16. Neufang

K. F. R.

Friedmann

Peters

P. E.

Fischer

P. G.

Kronholz

H. L.

: Erste klinische Erfahrungen mit einem Grossbildverstärker in der Thoraxdiagnostik. Fortschr. Röntgenstr. 137 (1982), 535.

17.

17. Swets

J. A.

Pickett

R. M.

: Evaluation of diagnostic systems. Methods from signal detection theory, p. 183. Academic Press, New York 1982.

Digital Chest Radiography with a Large Image Intensifier

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Keywords

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