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Photon-counting detector CT (PCD-CT), as the latest generation of CT technology, possesses incomparable advantages over conventional energy-integrating detector CT (EID-CT). However, there remains a research gap in the comparative evaluation of radiation dose characteristics between these two CT systems. This study systematically evaluated the signal-to-noise ratio (SNR) of iodinated contrast at various concentrations in PCD-CT phantom images, using enhanced CT scanning as the experimental model and comparing with an EID-CT system of the same architecture. The results demonstrate that under equivalent radiation dose levels, PCD-CT can improve the SNR by an average of 16.4% for iodine concentrations ranging from 2～15 mg/mL compared to EID-CT, confirming PCD-CT's advantage in low-dose imaging for iodinated contrast visualization. These findings provide quantitative evidence supporting PCD-CT's low-dose imaging superiority in contrast-enhanced CT examinations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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