Nonuniform sampling pitch acquisition method in myocardial single-photon emission computed tomography

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Cardiovascular Imaging

Background:

• Single-photon emission computed tomography (SPECT) is a tomographic imaging technique.
• Myocardial SPECT commonly uses 180° acquisition, leading to image distortions due to incomplete reconstruction.
• Full 360° acquisition provides complete reconstruction but increases patient testing time.

Purpose of the Study:

• To develop a novel acquisition method for myocardial SPECT.
• To reduce patient testing time without compromising image quality.
• To overcome limitations of 180° and 360° SPECT acquisition.

Main Methods:

• The nonuniform sampling pitch acquisition (NUSPA) method was developed.
• NUSPA reduces sampling counts by decreasing the pitch near the myocardium (RAO45-LPO45) and increasing it elsewhere.
• Sinograms were processed using nonuniform rational B-spline interpolation for uniform sampling before reconstruction.

Main Results:

• NUSPA methods (NUSPA-1 and NUSPA-2) used fewer views than 360° acquisition.
• Testing time was considerably reduced.
• Images reconstructed after interpolation showed no distortion or central count decrease.
• Image quality was nearly equivalent to 360° acquisition.

Conclusions:

• NUSPA effectively reduces SPECT myocardial imaging time.
• The method preserves image quality, avoiding distortions seen in 180° acquisition.
• NUSPA offers a practical solution for efficient and high-quality myocardial SPECT.