Characterization of photon‐counting multislit breast tomosynthesis

Abstract

The characterized system generates spectral tomosynthesis images with a dual-energy photon-counting detector. Measurements show a high DQE, enabling high image quality at a low dose, which is beneficial for low-dose applications such as screening. The single-scan spectral images open up for applications such as quantitative material decomposition and contrast-enhanced tomosynthesis.

Technical Note: Comparison of first‐ and second‐generation photon‐counting slit‐scanning tomosynthesis systems

“…For the S90 system, RSD 0 is 1060 mm, z ld is approximately 350 mm, and θ ranges from −17 ∘ to 17 ∘ . Other parameters have been published previously . The effect of the scan trajectory described by Eq.…”

“…The NPS was calculated for each ROI and an average slice NPS was calculated by averaging across the three slices weighted by the dose in each slice. The mean NPS and standard deviation was calculated over 16 ROIs …”

“…Other parameters have been published previously. 5 The effect of the scan trajectory described by Eq. (1) is to move the detector closer to the patient support and increase the minimum height reached by the precollimator.…”

“…In addition, there is a strong relation between tomosynthesis angle, detector width and total field of view and it is more complex to vary the angular sampling, to implement variable angular dose distributions and to acquire regular 2D images. Previous slit‐scanning geometries have either had rotational or linear scan motions …”

Cascaded systems analysis of shift‐variant image quality in slit‐scanning breast tomosynthesis

“…One point close to the origin of the coordinate system (point 1), three points along each individual axis (points 2, 3, and 4), and one point at the extremes of all three axes (point 5). For each point, the in‐slice MTF, NPS, and DQE were measured following a previously presented method . All images were acquired at 29 kVp and 12.7 mAs.…”