Noise properties for three weighted Feldkamp algorithms using a 256-detecotor row CT-scanner: case study for hepatic volumetric cine imaging.

In cone-beam geometry, image quality may be degraded or artifacts may occur if the cone angle is substantially wide. This is because a cone-beam scan along a circular orbit does not collect the complete set of data required to make an exact reconstruction of all volumetric data. To increase temporal resolution and thus image quality in cone-beam geometry, Silver proposed the new half-scan algorithm (NHS-FDK), which extends Parker's weighting function (HS-FDK) by utilizing a larger range up to 2pi. Here, we evaluated these algorithms for hepatic contrast-enhanced CT in cine scan mode using a 256-detector row CT. The full-scan (FS-FDK) images show uniform distribution of the image noise and CT-number uniformity. Image noise and CT-number uniformity with HS-FDK and NHS-FDK images follow the initial projection angle. HS-FDK images therefore have more changeable higher intensity (brighter) and a lower intensity (darker) areas than respective FS-FDK and NHS-FDK images. We concluded that, considering the trade-off between image quality and temporal resolution, the NHS-FDK algorithm is useful in volumetric cine imaging for the abdomen.

[1]  N. Suzuki,et al.  Volumetric Cine Imaging for Cardiovascular Circulation Using Prototype 256-Detector Row Computed Tomography Scanner (4-Dimensional Computed Tomography): A Preliminary Study With A Porcine Model , 2005, Journal of computer assisted tomography.

[2]  Takanori Tsunoo,et al.  Development and performance evaluation of the first model of 4-D CT-scanner , 2002 .

[3]  Naoki Suzuki,et al.  Real-Time Volumetric Imaging of Human Heart Without Electrocardiographic Gating by 256-Detector Row Computed Tomography: Initial Experience , 2005, Journal of computer assisted tomography.

[4]  Riwa Kishimoto,et al.  Clinical potentials for dynamic contrast-enhanced hepatic volumetric cine imaging with the prototype 256-MDCT scanner. , 2005, AJR. American journal of roentgenology.

[5]  W A Kalender,et al.  ECG-correlated image reconstruction from subsecond multi-slice spiral CT scans of the heart. , 2000, Medical physics.

[6]  B. Ohnesorge,et al.  Heart Rate Adaptive Optimization of Spatial and Temporal Resolution for Electrocardiogram-Gated Multislice Spiral CT of the Heart , 2001, Journal of computer assisted tomography.

[7]  Karl Stierstorfer,et al.  Novel reconstruction scheme for cardiac volume imaging with MSCT providing cone correction , 2002, SPIE Medical Imaging.

[8]  Hiroshi Aradate,et al.  Large-area two-dimensional detector for real-time three-dimensional CT (4D CT) , 2001, SPIE Medical Imaging.

[9]  Shinichiro Mori,et al.  Physical performance evaluation of a 256-slice CT-scanner for four-dimensional imaging. , 2004, Medical physics.

[10]  M D Silver.  A method for including redundant data in computed tomography. , 2000, Medical physics.

[11]  M. Endo,et al.  Evaluation of weighted FDK algorithms applied to four-dimensional CT (4D-CT) , 2004, IEEE Symposium Conference Record Nuclear Science 2004..

[12]  K Taguchi,et al.  High temporal resolution for multislice helical computed tomography. , 2000, Medical physics.

[13]  Katsuyuki Taguchi,et al.  Temporal resolution and the evaluation of candidate algorithms for four-dimensional CT. , 2003, Medical physics.

[14]  Hiroshi Asakura,et al.  Respiratory-gated segment reconstruction for radiation treatment planning using 256-slice CT-scanner during free breathing , 2005, SPIE Medical Imaging.

[15]  L. Feldkamp,et al.  Practical cone-beam algorithm , 1984 .

[16]  Takayuki Obata,et al.  Clinical potentials of the prototype 256-detector row CT-scanner. , 2005, Academic radiology.

[17]  D. Parker.  Optimal short scan convolution reconstruction for fan beam CT , 1982 .

[18]  K Faulkner.  Physics for Diagnostic Radiology (Second Edition) (Medical Science Series) , 2000 .

[19]  M. Defrise,et al.  Single-slice rebinning method for helical cone-beam CT. , 1999, Physics in medicine and biology.

[20]  A. Willemsen,et al.  Brain tumors: L-[1-C-11]tyrosine PET for visualization and quantification of protein synthesis rate. , 1995, Radiology.