Accelerating simultaneous algebraic reconstruction technique with motion compensation using CUDA-enabled GPU

  • Wai-Man Pang
  • Jing Qin
  • Yuqiang Lu
  • Yongming Xie
  • Chee-Kong Chui
  • Pheng-Ann Heng
Original Article

Abstract

Purpose

To accelerate the simultaneous algebraic reconstruction technique (SART) with motion compensation for speedy and quality computed tomography reconstruction by exploiting CUDA-enabled GPU.

Methods

Two core techniques are proposed to fit SART into the CUDA architecture: (1) a ray-driven projection along with hardware trilinear interpolation, and (2) a voxel-driven back-projection that can avoid redundant computation by combining CUDA shared memory. We utilize the independence of each ray and voxel on both techniques to design CUDA kernel to represent a ray in the projection and a voxel in the back-projection respectively. Thus, significant parallelization and performance boost can be achieved. For motion compensation, we rectify each ray’s direction during the projection and back-projection stages based on a known motion vector field.

Results

Extensive experiments demonstrate the proposed techniques can provide faster reconstruction without compromising image quality. The process rate is nearly 100 projections s−1, and it is about 150 times faster than a CPU-based SART. The reconstructed image is compared against ground truth visually and quantitatively by peak signal-to-noise ratio (PSNR) and line profiles. We further evaluate the reconstruction quality using quantitative metrics such as signal-to-noise ratio (SNR) and mean-square-error (MSE). All these reveal that satisfactory results are achieved. The effects of major parameters such as ray sampling interval and relaxation parameter are also investigated by a series of experiments. A simulated dataset is used for testing the effectiveness of our motion compensation technique. The results demonstrate our reconstructed volume can eliminate undesirable artifacts like blurring.

Conclusion

Our proposed method has potential to realize instantaneous presentation of 3D CT volume to physicians once the projection data are acquired.

Keywords

Simultaneous Algebraic Reconstruction Technique GPU-accelerated SART Tomography Reconstruction Motion Compensation for Tomography Reconstruction CUDA-enabled GPU acceleration 

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Copyright information

© CARS 2010

Authors and Affiliations

  • Wai-Man Pang
    • 1
  • Jing Qin
    • 2
  • Yuqiang Lu
    • 3
  • Yongming Xie
    • 4
  • Chee-Kong Chui
    • 5
  • Pheng-Ann Heng
    • 4
  1. 1.Spatial Media Group, Computer Arts LabUniversity of AizuAizuwakamatsuJapan
  2. 2.Department of Diagnostic RadiologyNational University of SingaporeKent RidgeSingapore
  3. 3.Shenzhen Institute of Advanced Integration TechnologyChinese Academy of Sciences/The Chinese University of Hong KongShenzhenChina
  4. 4.Department of Computer Science and EngineeringThe Chinese University of Hong KongShatinHong Kong
  5. 5.Department of Mechanical EngineeringNational University of SingaporeKent RidgeSingapore

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