SPECT (single-photon emission computed tomography) equipment for small animals

The invention discloses SPECT (single-photon emission computed tomography) equipment for small animals. The SPECT equipment comprises a collimator and an imaging detector, wherein at least one composite hole allowing a ray to penetrate is formed in the collimator, each composite hole includes a needle hole and a parallel hole which are sequentially communicated along the transmitting direction of the ray, the passing area of each needle hole increases or decreases gradually or decreases gradually and then increases gradually in the transmitting direction of the ray, and the passing area of each parallel hole is constantly unchanged. The SPECT equipment for the small animals has the advantages that the needle holes and parallel holes which are sequentially communicated are formed in the collimator, projection overlap is limited by the parallel holes and the amplification characteristic of the needle holes, and accordingly high-resolution SPECT reconstructed images can be obtained under limited detection area.