Novel display technique for reference images for visibility of temporal change on radiographs- color digital summation radiography-
Tóm tắt
The present study investigated color digital summation radiography (CDSR) as a novel display technique for reference images for the visibility of temporal change on radiographs. In CDSR, only the parts with temporal differences are displayed in color. Moreover, all other parts are displayed in gray scale. CDSR was defined as “radiographs combined by the additive color mixture method”. The visibility of simulated nodules located in the lung fields and mediastinum was evaluated by 12 radiologists (mean experience, 9.8 years; range, 1–26 years) for 24 conventional radiographs and CDSR for 6 color patterns. A five-point rating system (5, very good; 4, good; 3, adequate; 2, poor; 1, very poor) was used. The mean scores (average±standard deviation) for the visibility of simulated nodules were as follows: magenta, 3.88±0.90; blue, 3.08±0.72; green, 3.04±0.86; red, 3.00±0.98; cyan, 2.71±0.86; and yellow, 2.50±0.72. Compared to conventional radiography in gray scale, at 1.21±0.41, all six color patterns for CDSR displayed significantly improved scores (p<0.001). CDSR might represent a useful technique for reference images from chest digital radiography.
Tài liệu tham khảo
Donovan GW. Radiography in colour,Lancet, 1: 832–833, 1951.
Dowdy AH, Bonann LJ. Simulated color rontgengraphy.Am J Roentgenol Radium Ther Nucl Med, 70: 581–584, 1953.
Prins HR, Katz JL, Billmeyer FW Jr Investigations in colored radiography.Am J Roentgenol Radium Ther Nucl Med, 98: 966–978, 1966.
Bonann LJ, Dowdy AH. LogEtronic simplification in simulated color radiography.Radiology, 70: 585–587, 1958.
Pirkey EL, Parker JE Jr, Shook FW, Color as a teaching aid for diagnostic roentgenology.Radiology, 57: 81–82, 1951.
Schwarz GS. Subtraction radiography by means of additive color.Radiology, 87: 445–449, 1966.
Frey HS, Norman A. Radiographic subtraction by color addition.Radiology, 84: 123, 1965.
Wise RE, Ganson J. Subtraction technique: video and color methods.Radiology, 86: 814–821, 1966.
Morrish HF. Color-additive subtraction.Radiology, 92: 1211–1215, 1969.
Malacara D. InColor Vision and Colorimetry: Theory and Applications (SPIE Press, Washington), pp. 106–109, 2002.
Kano A, Doi K, MacMahon H,et al. Digital image subtraction of temporally sequential chest images for detection of interval change.Med Phys, 21: 453–461, 1994.
Difazio MC, MacMahon H, Xu XW,et al. Digital chest radiography: effect of temporal subtraction images on detection accuracy.Radiology, 202: 447–452, 1997.
Katsuragawa S, Tagashira H, Li Q,et al. Comparison of the quality of temporal subtraction images obtained with manual and automated methods of digital chest radiography.J Digit Imaging, 12: 166–172, 1999.
Ishida T, Ashizawa K, Engelmann R,et al. Application of temporal subtraction for detection of interval changes on chest radiographs: improvement of subtraction images using automated initial image matching.J Digit Imaging, 12: 77–86, 1999.
Ishida T, Katsuragawa S, Nakamura K,et al. Iterative image warping technique for temporal subtraction of sequential chest radiographs to detect interval change.Med Phys, 26: 1320–1329, 1999.
Chijiiwa H. InAn Outline of Color Science, (University of Tokyo Press, Tokyo), pp. 170–175, 2001. (in Jpse.)