| Zugriffsnummer | 16124 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Measurement of the noise components in the medical X-ray intensity pattern due to overlaying, nonrecognizable structures |
| Autor(in); Institution |
Tischenko, Oleg; Otto-von-Guericke-University Magdeburg, University Hospital, Department for Diagnostic Radiology, Magdeburg, GERMANY
Hoeschen, Christoph; Otto-von-Guericke-University Magdeburg, University Hospital, Department for Diagnostic Radiology, Magdeburg, GERMANY
Effenberger, Olaf; Otto-von-Guericke-University Magdeburg, University Hospital, Department for Diagnostic Radiology, Magdeburg, GERMANY
Reissberg, Steffen; Otto-von-Guericke-University Magdeburg, University Hospital, Department for Diagnostic Radiology, Magdeburg, GERMANY
Buhr, Egbert; 4.22, Bildanalyse, PTB-Braunschweig
Döhring, Wilfried; Otto-von-Guericke-University Magdeburg, University Hospital, Department for Diagnostic Radiology, Magdeburg, GERMANY
|
| Quelle/Jahr | Medical imaging 2003 - Physics of medical imaging : 16 - 18 February 2003, San Diego, California, USA:(2003), 422 - 432 |
| Schriftenreihe | Proceedings of SPIE: 5030,1 ; Progress in biomedical optics and imaging: 4,21 |
| Herausgeber(in) |
Yaffe, Martin J.
|
| ISSN | 0277-786X |
| ISBN | 0-8194-4831-1 |
| Verlag | Bellingham, Wash.: SPIE |
| Konferenzangaben | SPIE International Symposium Medical Imaging, San Diego, Calif., 15-20, February, 2003, USA |
| Freie Schlagworte | noise, ; anatomical noise ; two images ; rotation ; wavelets ; cross-correlation matching ; threshold |
| Zusammenfassung | There are many aspects that influence and deteriorate the detection of pathologies in X-ray images. Some of those are due to effects taking place in the stage of forming the X-ray intensity pattern in front of the x-ray detector. These can be described as motion blurring, depth blurring, anatomical background, scatter noise and structural noise. Structural noise results from an overlapping of fine irrelevant anatomical structures. A method for measuring the combined effect of structural noise and scatter noise was developed and will be presented in this paper. This method is based on the consideration that within a pair of projections created after rotation of the object with a small angle (which is within the typical uncertainty in positioning the patient) both images would show the same relevant structures whereas the projection of the fine overlapping structures will appear quite differently in the two images. To demonstrate the method two X-ray radiographs of a lung phantom were produced. The second radiograph was achieved after rotating the lung by an angle of about 3°. Dyadic wavelet representations of both images were regarded. For each value of the wavelet scale parameter the corresponding pair of approximations was matched using the cross correlation matching technique. The homologous regions of approximations were extracted. The image containing only those structures that appear in both images simultaneously was then reconstructed from the wavelet coefficients corresponding to the homologous regions. The difference between one of the original images and the noise-reduced image contains the structural noise and the scatter noise. |
Zitierung
Tischenko, O., Hoeschen, C., Effenberger, O., Reissberg, S., Buhr, E., & Döhring, W. (2003). Measurement of the noise components in the medical X-ray intensity pattern due to overlaying, nonrecognizable structures. SPIE International Symposium Medical Imaging, San Diego, Calif., 15-20, February, 2003, USA.