Improvement of image quality by tilted fan beam data acquisition in a helical scan x-ray CT
- Hosei Univ., Tokyo (Japan)
The helical scan x-ray CT is useful for high speed acquisition of three dimensional image data. In image reconstruction from helical scan data, a set of sequential data is used and the data are interpolated to produce projection data which reconstruct an image of a given cross section. This interpolation sometimes causes artifacts in the reconstructed image. We propose a new data acquisition method which minimizes the effect of scanning slice position in the axial direction. The proposed method inclines an x-ray detector array in the direction of rotation. The tilted angle is defined as arctan ({theta}L/2R{pi} tan {theta}), where L is the moving distance of a table per rotation and R is the radius of rotation of the x-ray source. The angle {theta} is the orthogonal projection of the half of a fan angle onto the parallel beam projection plane. Simulation results showed that our method eliminated the low frequency distortion and slightly improved the spatial resolution in the axial direction.
- OSTI ID:
- 513229
- Report Number(s):
- CONF-961123-; TRN: 97:014282
- Resource Relation:
- Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Anaheim, CA (United States), 2-9 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 IEEE nuclear science symposium - conference record. Volumes 1, 2 and 3; Del Guerra, A. [ed.]; PB: 2138 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-resolution helical cone-beam micro-CT with theoretically-exact reconstruction from experimental data
Completeness map evaluation demonstrated with candidate next-generation cardiac CT architectures