Barnsley, M. F. & Hurd, L. P. (1993) Fractal Image Compression, 1st ed., chap. 3, pp. 47-74. AK Peters Ltd.
Byhardt, R. W., Cox, J. D., Hornburg, A. & Liermann, G. (1978) Weekly localization films and detection of field placement errors. Int. J. Radiat. Oncol. Biol. Phys. 4, 881-887
Ding, G. X., Shalev, S. & Gluchev, G. (1993) A r-q technique for treatment verification in radiotherapy and its clinical applications. Med. Phys. 20, 1135-1143
Goitein, M. (1975) Immobilization error: Some theoretical considerations. Radiology 117, 407-412.
Lam, W. C., Partowmah, M., Lee, D. J., Whatam, M. D. & Lam, K. S. (1987) On-line measurement of field placement errors in external beam radiotherapy. Br. J. Radiol. 60, 361-367
Marks, J. E., Haus, A. G., Sutton, H. G. & Griem, M. L. (1976) The value of frequent treatment verification films in reducing localization error in the irradiation of complex fields. Cancer 37, 2755-2761.
McParland, B. J. (1993) Uncertainty of field placement errors in digital portal images. Phys. Med. Biol. 35, 299-323.
Pizer, S. M., Amburn, E. P., Austin, J. D., Cromartie, R., Geselowitz, A., ter Haar Romeny, B., Zimmerman, J. B. & Zuiderveld, K. (1987) Adaptive histogram equalization and its variations. Comput. Vis. Graph. Image Process. 39, 355-368
Press, W. H., Teukolsky, S. A., Vetterint, W. T. & Flannery, B. P. (1992) Numerical Recipes in C The Art of Scientific Computing, 2nd ed. , Cambridge University Press.
Rabinowitz, I., Broomberg, J., Goitein, M., McCathy, K. & Leong, J. (1985) Accuracy of radiation field alignment in clinical practice. Int. J. Radiat. Oncol. Biol. Phys. 11, 1857-1867
Research Systems, Inc. (1995) IDL Reference Guide Version 4.
Rosenman, J., Roe, C. A., Cromartie, R., Muller, K. E. & Pizer, S. M. (1993) Portal film enhancement: Technique and clinical utility. Int. J. Radiat. Oncol. Biol. Phys. 25, 333-338
Williams, J. R. & Thwaites, D. I. (1993) Radiotherapy Physics in practice, 1st ed., chap. 10, pp. 227-251. Oxford University Press.