Running QSPECT suite

1. Open C:\Users\studen\software\build\QSPECT\QSPECT_suite.exe

2. Load photopeak
   Point to NM0000XXXX.dcm

3. Resize image if needed/wanted.
   Tools -> Resize 1/2

4. Run AC-less reconstruction.
   Set Iterations=1, Subset=10, mark Double headed SPECT and Use GPU.
   Save NAC reconstruction (Involution_1i_10s_NAC.nii, optional). IMPORTANT: always save via File -> Save as Nifti.

5. Load CT
   Loading CT prior to reconstruction won't work, because CT is resampled to SPECT. Select Folder (CT)
   For patinets reconstruction: need to first order CT images (pydicom, some CT's already are), then split files to upper (torax) and lower (abdomen) part of CT image.

6. Run ACQC
   Tools -> ACQC. Correct position of CT to match SPECT. Save screenshot (snipping tool) of the fused/registered images in reconstruction file.

• phantoms: normally, one bin in Z, optionaly use translation/rigid registration
• patients: HARD TASK! Try manually correct CT (look at chin, arms, bladder ect.), then use rigid transformation (beforehand try translation)
  --> for more: "A quantitative reconstruction software suite for SPECT imaging" (M. Naimas, R. Jeraj)

7. Reconstruct with AC
   Set Iterations=3, Subset=10, mark Double headed SPECT, Use GPU for resized images, for non-resized often only CPU works. Use conbinations of CTAC (CT Attenuation correction), SC (Scatter correction) and PSF (Point spread function). For non-resized images use CTAC and SC combination.

8. Store reconstruction
   to the same directory where SPECT and CT directories are or separate dir: reconstruction
   name (automated): Involution_3i_10s_AC_SC.nii - carefull with names for resized (w/o appendix) and non-resized images (add appendix -full) - save the latter reconstruced of the two in other file, rename it, and put in in reconstruction file, as they have same automated name and second overwrites the first one!