学位論文

位相限定相関法を用いたSPECT画像の動き補正

Correction of patient movement with a phase-only correlation method in a SPECT study

jpn

2012-03-24

Not Applicable (or Unknown)

2012-03-24

修士(工学)

工学研究科情報電子工学専攻; 指導教授: 尾川浩一

Patient movement during SPECT data acquisition makes serious distortions in reconstructed images. This paper proposes a new correction method of patient movement. This method basically uses a phase-only correlation method. We applied the phase-only correlation method to both a sonogram space and image space. That is, we apply a one dimensional Fourier transform to a measured sonogram and detect an angel at which a movement occurs with the phase information. After we detect the angel at which a movement takes place, we split the sonogram into two angular regions and reconstruct images corresponding to these angular regions. We also apply a one-dimensional Fourier transform to these reconstructed images and estimate the extent of movement. Next we replace the wrong projection data with correct data that are calculated by forward projection of the image positioned correctly. By reconstructing an image with a corrected sonogram we could obtain a distortion free image. This paper showed the validity of our method with some simulations.

Thesis