Tungsten alloy is a safe and reliable radiation shielding material that can replace the traditional radiation shielding material lead for parallel-hole collimator - the most commonly used collimator for stationary SPECT imaging in hospitals. As a new type of radiation shielding material, tungsten alloy has many advantages such as high strength, good processability, no secondary bremsstrahlung radiation, and environmental protection for applications of parallel-hole collimator. Also, the thickness of tungsten alloy is only 2/3 of lead to obtain the same shielding effect. Wherein, SPECT is the short for single photon emission computed tomography.
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It has been reported that recent developments in metal additive manufacturing are making novel collimator designs possible, giving rise to new opportunities in SPECT imaging. Some researchers have proposed an innovative type of collimator for stationary SPECT, using parallel-holes whose collimation direction depends on their axial position. Its main advantage compared to current stationary SPECT systems with pinhole collimator is that, using only axial bed translations, to achieve complete angular sampling of an increased portion of the transaxial area of the collimator bore. This allows the system to be much more compact than current stationary SPECT systems that image objects of the same size.
