D-SPECT represents the next step in the evolution of SPECT technology and is based on a unique acquisition geometry. It has nine arrays of cadmium zinc telluride (CZT) detectors, each of which rotates around its central axis with programmable angular rotation 1. The detectors are very compact allowing movement that is not possible with conventional sodium chloride arrays, and the tungsten collimators have a larger aperture area and shorter length. D-SPECT is said to have ‘region-centric’ acquisition 1.
D-SPECT advantages over conventional SPECT include 1:
- better energy resolution (by means of CZT detectors)
- higher sensitivity (by means of wide-angle collimators)
- higher count rate (made possible by the signal processing electronics and pixellation of D-SPECT detectors)
- allows imaging of patient weighing up to 225 kg (550 lbs) (made possible by the open chair design)
- significantly reduced radiation exposure
- faster acquisition time
- capable of simultaneous dual radionuclide (Tc-99m and Tl-201) stress and rest cardiac studies 2
The excellent count rate combined with its high sensitivity facilitates high-quality dynamic acquisition.
D-SPECT disadvantages compared to SPECT 1:
- poorer geometric resolution (due to larger aperture area with shorter length), however, a reconstruction recovery algorithm permits restoration of resolution ultimately leads to equal or better resolution
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