This study used a modified chest PCCT workflow with an inspiratory scan followed by an expiratory scan 5 minutes later after IV contrast administration.
The protocol was designed to derive lung morphology, vasculature, perfusion, ventilation, and late contrast enhancement from one examination.
In 166 of 196 patients, all CT-derived parameters were obtained, and the reported mean CTDIvol and DLP for both scans remained below the stated diagnostic reference level.
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Scanner | NAEOTOM Alpha |
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Scan area | Chest |
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Scan mode | Quantum HD Inspiratory PCCT followed by expiratory PCCT after 5 min |
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Patient position | supine |
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Tube voltage [kV] | 120 |
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Effective mAs [mAs] | n.a. |
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IQ level | 67 |
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Dose modulation | n.a. |
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CTDIvol [mGy] | 3.22 (insp), 3.09 (exp) |
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DLP [mGy*cm] | 110.32 (insp), 109.47 (exp) |
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Rotation time [s] | 0.25 |
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Pitch | 1.4 |
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Matrix | Auto |
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Slice collimation [mm] | 120 x 0.2 |
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Slice width [mm] | 1.0 mm |
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Reconstruction increment [mm] | 0.7 mm |
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Reconstruction kernel | QR40 (VNC, PBV)
Br40 Monoenergetic Br60 Lung |
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KeV level [keV] | n.a. |
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Spectral reconstruction | VNC, PBV |
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Contrast | Iodine |
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Volume [mL] | 50 |
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Flow rate [mL/s] | 3.5 |
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Bolus tracking | yes |
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Scharm SC, Schaefer-Prokop C, Winther HB, et al.
Regional Pulmonary Morphology and Function: Photon-counting CT Assessment
. Radiology, 2023; 308(1): e230318
