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Progressive cone beam CT dose control in image-guided radiation therapy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The workflow of PINLM-PDC. Illustrations of the relationship between imaging dose and image quality in (b) using the proposed PINLM-PDC scheme and in (c) using the current standard low-dose scheme. Plots are drawn for illustrative purpose and not to scale.

Image of FIG. 2.
FIG. 2.

CBCT images scanned at (a) 0.8 mAs, (b) 0.4 mAs, (c) 0.2 mAs, and (d) enhanced by using PINLM on image (c) with image (b) as the prior image. The noise standard deviation (std) is measured inside the square area and the averaged std is labeled in the upright corner of each subfigure. (Top row) Contrast slice displayed with window [−125, 225] HU and (bottom row) resolution slice displayed with window [−225, 725] HU.

Image of FIG. 3.
FIG. 3.

Image profiles at resolution line pairs (a) and the ramp wire (b) for different cases. For a better visual comparison, profiles are shifted vertically by 200 HU each.

Image of FIG. 4.
FIG. 4.

Synthetic CBCT images of the same longitudinal position on days 1–4. (a) Standard protocol; (b) dynamic-dose protocol (gradually reduced exposure level at 0.4, 0.1, 0.07, and 0.05 mAs for days 1–4); (c) PINLM-PDC with the same mAs settings as in (b).

Image of FIG. 5.
FIG. 5.

(a) The difference (in days 2–4) between the standard-protocol (0.4 mAs) and the dynamic-dose protocol images. (b) Difference between the standard-protocol and the PINLM-PDC images. (c)–(e) show image intensity profiles along the cuts indicated by the arrows.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Progressive cone beam CT dose control in image-guided radiation therapy