Optimising dual-energy CT scan parameters for virtual non-calcium imaging of the bone marrow: a phantom study
| Autor: | Christian Booz, Henrik Børgesen, Kasper Kjærulf Gosvig, Bernhard Schmidt, Bernhard Krauss, Mikael Boesen, Felix C. Müller, Anders Rodell |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Medical physics. Medical radiology. Nuclear medicine
Scanner Materials science Mean squared error business.industry Phantoms Imaging lcsh:R895-920 Ultrasound Filter (signal processing) Rotation Tomography (x-ray computed) Standard deviation Imaging phantom Bone and bones Bone Marrow Image noise Radiology Nuclear Medicine and imaging Original Article MeSH does not recognize this term Prospective Studies business Phantoms (imaging) Tomography X-Ray Computed Biomedical engineering |
| Zdroj: | European Radiology Experimental European Radiology Experimental, Vol 3, Iss 1, Pp 1-8 (2019) |
| ISSN: | 2509-9280 |
| Popis: | Background We investigated the influence of dose, spectral separation, pitch, rotation time, and reconstruction kernel on accuracy and image noise of virtual non-calcium images using a bone marrow phantom. Methods The phantom was developed at our institution and scanned using a third-generation dual-source dual-energy CT scanner at five different spectral separations by varying the tube-voltage combinations (70 kV/Sn150 kV, 80 kV/Sn150 kV, 90 kV/Sn150 kV, and 100 kV/Sn150 kV, all with 0.6-mm tin filter [Sn]; 80 kV/140 kV without tin filter) at six different doses (volume computed tomography dose index from 1 to 80 mGy). In separate experiments, rotation times, pitch, and reconstruction kernels were varied at a constant dose and tube voltage. Accuracy was determined by measuring the mean error between virtual non-calcium values in the fluid within and outside of the bone. Image noise was defined as the standard deviation of virtual non-calcium values. Results Spectral separation, dose, rotation time, or pitch did not significantly correlate (p > 0.083) with mean error. Increased spectral separation (rs-0.96, p rs-0.98, p rs 0.83, p = 0.015) and image noise (rs 1.0, p Conclusions Increased dose and increased spectral separation significantly lowered image noise in virtual non-calcium images but did not affect the accuracy. Virtual non-calcium reconstructions with similar accuracy and image noise could be achieved at a lower tube-voltage difference by increasing the dose. |
| Databáze: | OpenAIRE |
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