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Photon-Counting Computed Tomography (PC-CT) of the spine: impact on diagnostic confidence and radiation dose
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Journal Article
Photon-Counting Computed Tomography (PC-CT) of the spine: impact on diagnostic confidence and radiation dose
2023
Overview
Objectives
Computed tomography (CT) is employed to evaluate surgical outcome after spinal interventions. Here, we investigate the potential of multispectral photon-counting computed tomography (PC-CT) on image quality, diagnostic confidence, and radiation dose compared to an energy-integrating CT (EID-CT).
Methods
In this prospective study, 32 patients underwent PC-CT of the spine. Data was reconstructed in two ways: (1) standard bone kernel with 65-keV (PC-CT
std
) and (2) 130-keV monoenergetic images (PC-CT
130 keV
). Prior EID-CT was available for 17 patients; for the remaining 15, an age–, sex–, and body mass index–matched EID-CT cohort was identified. Image quality (5-point Likert scales on overall, sharpness, artifacts, noise, diagnostic confidence) of PC-CT
std
and EID-CT was assessed by four radiologists independently. If metallic implants were present (
n
= 10), PC-CT
std
and PC-CT
130 keV
images were again assessed by 5-point Likert scales by the same radiologists. Hounsfield units (HU) were measured within metallic artifact and compared between PC-CT
std
and PC-CT
130 keV
. Finally, the radiation dose (CTDI
vol
) was evaluated.
Results
Sharpness was rated significantly higher (
p
= 0.009) and noise significantly lower (
p
< 0.001) in PC-CTstd vs. EID-CT. In the subset of patients with metallic implants, reading scores for PC-CT
130 keV
revealed superior ratings vs. PC-CT
std
for image quality, artifacts, noise, and diagnostic confidence (all
p
< 0.001) accompanied by a significant increase of HU values within the artifact (
p
< 0.001). Radiation dose was significantly lower for PC-CT vs. EID-CT (mean CTDI
vol
: 8.83 vs. 15.7 mGy;
p
< 0.001).
Conclusions
PC-CT of the spine with high-kiloelectronvolt reconstructions provides sharper images, higher diagnostic confidence, and lower radiation dose in patients with metallic implants.
Key Points
•
Compared to energy-integrating CT, photon-counting CT of the spine had significantly higher sharpness and lower image noise while radiation dose was reduced by 45%.
•
In patients with metallic implants, virtual monochromatic photon-counting images at 130 keV were superior to standard reconstruction at 65 keV in terms of image quality, artifacts, noise, and diagnostic confidence.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
