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. Author manuscript; available in PMC: 2021 Oct 28.
Published in final edited form as: Phys Med Biol. 2021 Oct 27;66(20):10.1088/1361-6560/ac155e. doi: 10.1088/1361-6560/ac155e

Table 2:

Scan and reconstruction parameters for patient exams

Chest Temporal bone Contrast-enhanced abdomen Head CTA
Modality EID-CT PCD-CT EID-CT PCD-CT PCD-CT PCD-CT
Scanner platform SOMATOM Force SOMATOM Count Plus SOMATOM Force SOMATOM Count Plus SOMATOM Count Plus SOMATOM Count Plus
Acquisition mode Standard (single-energy) UHR UHR (comb-filter) UHR Standard (multi-energy) Standard (multi-energy)
Collimation (mm) 192 × 0.6 120 × 0.2 64 × 0.6 120 × 0.2 144 × 0.4 144 × 0.4
X-ray focal spot size (mm2) 0.8 × 1.1 0.6 × 0.7 0.4 × 0.5 0.4 × 0.5 0.8 × 1.1 0.8 × 1.1
Tube voltage (kV) 120 120 120 120 140 140
Automatic Exposure (CARE Dose4D) ON ON ON OFF ON ON
Tube current time product (mAs) 80 (QRM) 70 (QRM) 400 (QRM) 182 (effective) 140 (QRM) 150 (QRM)
CTDIvol (mGy, size) 5.3 (32 cm) 5.3 (32 cm) 49.9 (16 cm) 31.6 (16 cm) 11.7 (32 cm) 16.1 (16 cm)
Pitch 1.2 1.2 0.35 1.2 0.8 1.2
Rotation time (s) 0.25 0.33 1.0 1.0 0.5 0.33
Energy threshold (keV) NA 20 NA 20 20, 70 20, 70
Reconstruction technique ADMIRE PNR ADMIRE PNR WFBP PNR PNR
Reconstruction kernel (IR strength) Qr54 (3) Qr76 (1,3) Ur77 (3), Ur89 (3) Hr76 (3), Hr89 (3) Br44 Br44 (1,3) Qr40 (3)
Slice thickness (mm) 0.6 0.6, 0.2 0.4 0.4 3.0 3.0
Slice increment (mm) 0.5 0.5, 0.1 0.3 0.3 3.0 3.0
Reconstruction FOV (mm) 340 340 80 80 380 250
Image matrix size 1024 1024 512 512 512 512

EID-CT: Energy-integrating detector-based computed tomography; PCD-CT: Photon-counting detector-based computed tomography; CTA: CT angiography; FOV: Field of view; CTDIvol: volume CT dose index; QRM: Quality reference mAs; IR: Iterative reconstruction; WFBP: Weighted filtered back projection; ADMIRE: Advanced modeled iterative reconstruction; PNR: Prior-based noise reduction