Table 3. CT acquisition parameters and scanner characteristics.
| Study (No. reference) | Image acquisition time | CT scanner | Slice thickness (mm) | Slice interval (mm) | Tube voltage (kv) | Tube current modulation (mAs) | Contrast enhancement | No. CT readers | CT reader experience (year) |
|---|---|---|---|---|---|---|---|---|---|
| Zhou SC et al. (14) | Initial CT and follow-up CT | the 16-MDCT LightSpeed scanner (GE Healthcare) or the uCT 760 scanner (United Imaging) | 1.25 | NR | 100–120 | 200–300 | No | 2 | 13, 9 respectively |
| Wu J et al. (38) | All patients’ initial CT and 35 last follow-up CT | Siemens SOMATOM Definition AS 128-slice spiral CT, US; NeuViz 128-slice CT, China; GE LightSpeed V spiral CT, US | 5 | NR | NR | NR | No | 10 | >5 |
| Shi BB et al. (39) | Unclear | Cannon Aquilion Prime 160 16-slice CT | 5 | 5 | 120 | NR | No | 2 | NR |
| Dai H et al. (8) | On admission, within 24 h after admission | GE Bright Speed Elite 16, Neusoft 16, SOMATOM Emotion, SOMATOM definition AS, PHLIPS MX-16, Philips 64-row spiral Ingenuity and the UNITED IMAGING Elite 16 | 5 | NR | 120 | 110 | No | 5 | >10 |
| Damiano C et al. (40) | After the RT-PCR swabs | 128-slice CT (GE Revolution EVO 64 Slice CT Scanner) | 0.625 | NR | 120 | 100–250 | No | 2 | 15, 25 respectively |
| Han R et al. (11) | On admission, initial CT | BrightSpeed (GE Healthcare) or Somatom, Definition Flash (Siemens Healthineers) scanner | 10 | NR | 120 | 50–350 | No | 2 | >5 |
| Zhao W et al. (9) | On admission, mean interval between first CT scan and admission: 1d | Anatom 16HD (Anke Medical Solutions), HiSpeed-Dual (GE Healthcare), 64-MDCT LightSpeed VCT (GE Healthcare), and Somatom Emotion (Siemens Healthcare) | 0.625-5 | NR | 120 | 100–200 | No | 2 | 5, 15 respectively |
| Lu XF et al. (41) | On admission, initial CT | GE HealthOptima 680 and Brightspeed CT | 0.625 | 5 | 120 | 200 | No | 2 | NR |
| Zhu ZX et al. (42) | On admission, initial CT | GE Optima 660 | 0.625 | 5 | 120 | 50–400 | No | 2 | NR |
| Cheng SP et al. (13) | Initial CT: within 1w after positive RT-PCR test; follow-up CT: during hospitalization | Siemens: 16-slice spiral CT; GE: 64-slice spiral CT; Philips: 128-slice spiral CT | 5 | 5 | 100–120 | 100–200 | No | 2 | NR |
| Li M et al. (43) | Initial CT: on admission; follow-up CT: during hospitalization | GE/Siemens: 64-slice spiral CT | 2.5 | NR | 120 | 100 | No | 3 | >10 |
| Lei PG et al. (15) | On admission, initial CT | 128-slice MSCT (SOMATOM Definition AS+, Siemens, Germany); 16-slice MSCT (Aquilion16, Toshiba Medical, Nasu, Japan)” | 1 or 5 | NR | 120 | 150 | No | 2 | 6, 20 respectively |
| Jie BK et al. (44) | Initial CT: on admission; follow-up CT: during hospitalization | 128-slice spiral CT system (LianYing, Shanghai, China) | 5 | NR | 80–120 | NR | No | 2 | NR |
| Zhao SQ et al. (45) | On admission, initial CT | GE Optimal 680 64-channel 128-slice spiral CT | 0.625 | NR | 120 | 120–150 | No | 2 | NR |
| Pascal L. et al. (46) | On admission, initial CT | MDCT scanner with 64 channels | 1 | 1 | 120 | 60–120 | No | 2 | 12, 32 respectively |
| Meng C et al. (47) | Initial CT | Neusoft 128-slice spiral CT | 1 | 1 | NR | NR | No | 2 | >5 |
| Li XH et al. (48) | On admission, initial CT | Toshiba Aquilion 64-slice CT, GE Light Speed CT, GE Optima CT540 16-slice CT | 5 | 2 | 120 | 120–200 | No | 2 | NR |
| Li L et al. (49) | 0–5 d from symptom onset | Philips Brilliance iCT 256 | 5 | NR | 120 | NR | No | 2 | NR |
| Zhang Y et al. (50) | Initial CT | GE Lightspeed 16-slice CT | 5 | 2 | NR | NR | No | NR | NR |
| Xiao HJ et al. (51) | Initial CT: on admission; follow-up CT: 3–6 d after first CT scan | GE Revolution; SOMATOM Force, Siemens | 1 | 0.5–1.0 | 120 | 50–200 | No | 2 | >8 |
| Hu R et al. (52) | Unclear | GE OPTIMA 540 16-slice CT scanner | 5 | 5 | 120 | 200 | No | 3 | NR |
| Bai HX et al. (53) | Unclear | SIEMENS: SOMATOM Definition; Emotion 16; SOMATOM go.Now; SOMATOM Definition AS20; SOMATOM Definition AS+ GE: BrightSpeed; LightSpeed Ultra; LightSpeed VCT/Resolution; Lightspeed 16/Optima CT580 Philips: Access CT; Hitachi ECLOS | 0.6–2.5 | NR | 100–130 | 30–450 | No | 2 | >5 |
CT, computed tomography; MDCT, multidetector computed tomography; MSCT, multislice computed tomography/multisection computed tomography; GE, General Electric Company; NR, not reported.