Selection of optimal tube potential settings for dual-energy CT virtual mono-energetic imaging of iodine in the abdomen

Autor: Joshua Grimes, Joel G. Fletcher, Shuai Leng, Lifeng Yu, Gregory J. Michalak, Cynthia H. McCollough, Ahmed F. Halaweish
Rok vydání: 2017
Předmět:
Zdroj: Abdominal Radiology. 42:2289-2296
ISSN: 2366-0058
2366-004X
DOI: 10.1007/s00261-017-1122-7
Popis: To determine the appropriate tube potential settings for dual-source, dual-energy data acquisition across a range of phantom sizes, and to determine the optimal photon energies for virtual mono-energetic imaging. Water phantoms (15–50-cm wide) containing an iodine test object were scanned on a third-generation dual-source CT scanner using all available tube potential pairs. Virtual mono-energetic images at 40, 50, 60, and 70 keV were produced using Mono-energetic Plus. To determine the practical operating parameters for the evaluated CT system, data exclusions were made based on water CT number accuracy, artifacts, and using a noise constraint. Image quality metrics were measured and compared. Excluded tube potential pairs were identified; these were generally at low tube potentials for the low-energy beam and low photon energies. For non-excluded conditions, the highest CNR was obtained using the 70/150Sn setting in phantoms ≤35 cm at 40 keV. 70/150Sn provided optimal iodine CNR below 40 cm lateral phantom width at 40 keV, while 90/150Sn allowed acceptable image quality in phantoms >40-cm wide at or above 60 keV.
Databáze: OpenAIRE
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