PRISIM reconstruction with iteratively updated taylor approximation.

<p>PRISIM reconstruction with iteratively updated taylor approximation.</p

Comparison of the reconstructed profiles versus the ground truth when without data noise.

<p>The blue solid lines are the reconstructed profiles; while the red solid ones are the ground truth. All the pixels are outside the spectral FOV/ROI defined by the PCDs. From (a) to (h) are the results in the 1^st to 8^th energy channels respectively. The two red ellipses in (a) show the Gadolinium clusters.</p

Dynamic bowtie in fan-beam geometry for a balanced flux distribution upon an equiangular detector array.

<p>(a) No object in the field of view (FOV) corresponds to a liquid highly attenuating bowtie (HB); (b) an elliptical phantom in the FOV corresponds to the HB containing a weakly attenuating bowtie (WB) that compensates for the attenuation due to the phantom; and (c) the WB is synchronously rotated with the gantry for dynamic compensation (for example, ).</p

Exemplary designs of the dynamic bowtie without driving components.

<p>(a) A dynamic bowtie for fan-beam CT, (b) and (c) for cone-beam CT and spiral multi-slice CT respectively. The attenuating liquid for HB is solution. The WB material is air. The containers for HB and WB are made of 0.5 mm thick aluminum and 0.2 mm thick plastic, respectively.</p

Numbers of detected photons along x-rays through the head CT volume without and with the proposed dynamic bowtie (on a log scale).

<p>(a) and (b) Numbers of detected photons assuming without a bowtie for and respectively. (c) and (d) Numbers of detected photons assuming with a proposed bowtie for and respectively.</p

Realistic numerical phantom from clinical CT datasets.

<p>(a) Water and (b) bone material basis functions obtained from a GE Discovery CT750 scanner, and (c) the mono-energy image in the fourth energy channel. The display windows are [0, 4.16], [0, <i>10</i>], and [0, 0.23] for water, bone and the mono image, respectively.</p

Dynamic bowtie for full body helical CT, in which the WB is rapidly prototyped according to an individualized patient contour obtained from surface scanning.

<p>Dynamic bowtie for full body helical CT, in which the WB is rapidly prototyped according to an individualized patient contour obtained from surface scanning.</p

Projections of an elliptical water phantom and the bowtie profile.

<p>The projection angle is indexed by the projection number , , . The ray angle is indexed by the horizontal detector number, . The ray angle is indexed by the vertical detector number, . (a)–(b) Surface displays of the sinogram from a water phantom for and respectively, and (c) the bowtie profile for and .</p

Gadolinium reconstruction errors versus its distance to the center in the case of .

<p>(a) The results in the case of the Gadolinium spot, and (b) is the results in the case of a Gadolinium strip.</p

Comparison of the reconstructed profiles versus the ground truth along the central horizontal line when without data noise.

<p>The blue solid lines are the profiles through the reconstructed images. The purple dash-dot ones are the initial estimation. The red solid ones are the ground truth. The yellow dash ones indicate the FOV defined by the PCDs. From (a) to (h) are the results in the 1^st to 8^th energy channels respectively.</p