Flat panel computed tomography for non-invasive flow measurement: initial results in in-vitro studies

Abstract

The purpose was to evaluate the feasibility of flat panel computed tomography (FPCT) for quantifying flow by analyzing contrast changes along the z-axis in an in-vitro setting. Contrast material was injected in a 3-mm silicone tube at flow rates of 0.1, 0.2, 0.5 and 1.0 ml/s using a commercially available injector pump. FPCT scans of this phantom were performed with a gantry rotation time of 3 s. From this data 41 phases were reconstructed at different points in time using a full and a partial gantry rotation. The differences in the contrast material arrival time and the contrast enhancement along the z-axis were recorded. Flow was calculated from this data and compared to the injector settings. There was a good agreement between the injector settings and the calculated flow rates, but agreement decreased with increasing flow rates. Absolute (percent) mean deviation between the injector settings and calculated flow values was 0.0230 +/- 0.0489ml/s (3.7243 +/- 4.7817%) using the full gantry rotation. Repeated-measurement ANOVA failed to show significant differences between the various techniques (p = 0.9726). FPCT allows for computing flow. While preliminary results indicate a good agreement at low flow rates, further studies are needed to assess this technique for higher flow rates.

Evaluation of demineralized bone and bone transplantsin vitroandin vivowith cone beam computed tomography imaging

“…Several manufacturers have developed more advanced image intensifiers, and flat panel technology has become a further detector type in sectional radiography. [4][5][6][7] Current flat panel volume CT devices in dentistry include, for instance, the Accuitomo (Morita, Osaka, Japan), NewTom VG (Quantitative Radiology, Verona, Italy), ProMax 3D (Planmeca, Helsinki, Finland), Picasso (E-Woo, Giheung-gu, South Korea), KaVo 3DeXam (former i-CAT) (KaVo, Biberach, Germany), and several Orange Dental devices including Picasso Master (Orange Dental, Bora-dong, South Korea), Scanora 3D (Soredex, Subang Jaya, Malaysia) and Iluma (Kodak Dental Systems, Rochester, NY).…”