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Evaluation of an iterative model-based reconstruction algorithm for low-tube-voltage (80 kVp) computed tomography angiography.

No√ęl PB, K√∂hler T, Fingerle AA, Brown KM, Zabic S, M√ľnzel D, Haller B, Baum T, Henninger M, Meier R, Rummeny EJ, Dobritz M - J Med Imaging (Bellingham) (2014)

Bottom Line: The effective dose level was, on average, 3.0 mSv for 80-kVp acquisitions.Low-tube-voltage CTAs significantly improve vascular contrast as presented by others; however, this effect in combination with IMBR enabled yet another substantial improvement of diagnostic quality.For IMBR, a significant improvement of image quality and a decreased radiation dose at low-tube-voltage can be reported.

View Article: PubMed Central - PubMed

Affiliation: Technische Universit√§t M√ľnchen , Department of Radiology, Munich 81675, Germany.

ABSTRACT
The objective of this study was to investigate the improvement in diagnostic quality of an iterative model-based reconstruction (IMBR) algorithm for low-tube-voltage (80-kVp) and low-tube-current in abdominal computed tomography angiography (CTA). A total of 11 patients were imaged on a 256-slice multidetector computed tomography for visualization of the aorta. For all patients, three different reconstructions from the low-tube-voltage data are generated: filtered backprojection (FBP), IMBR, and a mixture of both [Formula: see text]. To determine the diagnostic value of IMBR-based reconstructions, the image quality was assessed. With IMBR-based reconstructions, image noise could be significantly reduced, which was confirmed by a highly improved contrast-to-noise ratio. In the image quality assessment, radiologists were able to reliably detect more third-order and higher aortic branches in the IMBR reconstructions compared to FBP reconstructions. The effective dose level was, on average, 3.0 mSv for 80-kVp acquisitions. Low-tube-voltage CTAs significantly improve vascular contrast as presented by others; however, this effect in combination with IMBR enabled yet another substantial improvement of diagnostic quality. For IMBR, a significant improvement of image quality and a decreased radiation dose at low-tube-voltage can be reported.

No MeSH data available.


Related in: MedlinePlus

A 72-year-old male patient with an aneurysm of about 6¬†cm after placement of an abdominal stent. The panels (A‚ÄďD) from left to right: preliminary FBP, , IMBR, and FBP reconstruction. The effective dose of the low-tube-voltage (80¬†kVp) examination was 1.86¬†mSv (panels B, C, and D), compared to 8.82¬†mSv with high-tube-voltage (120¬†kVp) (panel A). (window width, 1200¬†HU; window center, 200¬†HU).
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f1: A 72-year-old male patient with an aneurysm of about 6¬†cm after placement of an abdominal stent. The panels (A‚ÄďD) from left to right: preliminary FBP, , IMBR, and FBP reconstruction. The effective dose of the low-tube-voltage (80¬†kVp) examination was 1.86¬†mSv (panels B, C, and D), compared to 8.82¬†mSv with high-tube-voltage (120¬†kVp) (panel A). (window width, 1200¬†HU; window center, 200¬†HU).

Mentions: Figure 1 shows the coronal tomographic images of a 72-year-old male patient with an aneurysm of about 6 cm after placement of an abdominal stent. Panel A shows a preliminary examination with high-tube-voltage (120 kVp) and an effective dose of 8.82 mSv, which took place 14 months before the study. Panel B presents the mixture of both reconstructions, panel C is the IMBR reconstruction, and panel D is the FBP reconstruction. The effective dose of the low-tube-voltage (80 kVp) examination was 1.86 mSv (panels B, C, and D). We observed that the anatomical and pathological morphologies are more visible with IMBR-based reconstruction compared to the conventional FBP reconstruction. Subjectively, the diagnostic quality may rise above the preliminary examination because of the increased iodine contrast and the image noise is reduced substantially. Figure 2 illustrates the same patient as in Fig. 1 in an axial orientation. Panel A shows the preliminary examination, panel B is the mixture of both reconstruction, panel C is the IMBR reconstruction, and panel D is the FBP reconstruction. The white marked and enlarged area focuses on the aneurysm and includes an endoleak. Clearly, the endoleak is visible in panels A to C, but is harder to detect in the FBP reconstruction of the low-tube-voltage data. Figure 3 shows axial-tomographic images of a 62-year-old male patient with an aortic dissection. Panel A illustrates the mixture of both reconstructions, panel B is the IMBR reconstruction, and panel C is the FBP reconstruction. Note that for this patient, no preliminary examination was available. The effective dose for this acquisition was 2.32 mSv. The strongly eliminated noise enables the detection of the aortic dissection in panels A and B, while it is hard to detect in panel C.


Evaluation of an iterative model-based reconstruction algorithm for low-tube-voltage (80 kVp) computed tomography angiography.

No√ęl PB, K√∂hler T, Fingerle AA, Brown KM, Zabic S, M√ľnzel D, Haller B, Baum T, Henninger M, Meier R, Rummeny EJ, Dobritz M - J Med Imaging (Bellingham) (2014)

A 72-year-old male patient with an aneurysm of about 6¬†cm after placement of an abdominal stent. The panels (A‚ÄďD) from left to right: preliminary FBP, , IMBR, and FBP reconstruction. The effective dose of the low-tube-voltage (80¬†kVp) examination was 1.86¬†mSv (panels B, C, and D), compared to 8.82¬†mSv with high-tube-voltage (120¬†kVp) (panel A). (window width, 1200¬†HU; window center, 200¬†HU).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4478879&req=5

f1: A 72-year-old male patient with an aneurysm of about 6¬†cm after placement of an abdominal stent. The panels (A‚ÄďD) from left to right: preliminary FBP, , IMBR, and FBP reconstruction. The effective dose of the low-tube-voltage (80¬†kVp) examination was 1.86¬†mSv (panels B, C, and D), compared to 8.82¬†mSv with high-tube-voltage (120¬†kVp) (panel A). (window width, 1200¬†HU; window center, 200¬†HU).
Mentions: Figure 1 shows the coronal tomographic images of a 72-year-old male patient with an aneurysm of about 6 cm after placement of an abdominal stent. Panel A shows a preliminary examination with high-tube-voltage (120 kVp) and an effective dose of 8.82 mSv, which took place 14 months before the study. Panel B presents the mixture of both reconstructions, panel C is the IMBR reconstruction, and panel D is the FBP reconstruction. The effective dose of the low-tube-voltage (80 kVp) examination was 1.86 mSv (panels B, C, and D). We observed that the anatomical and pathological morphologies are more visible with IMBR-based reconstruction compared to the conventional FBP reconstruction. Subjectively, the diagnostic quality may rise above the preliminary examination because of the increased iodine contrast and the image noise is reduced substantially. Figure 2 illustrates the same patient as in Fig. 1 in an axial orientation. Panel A shows the preliminary examination, panel B is the mixture of both reconstruction, panel C is the IMBR reconstruction, and panel D is the FBP reconstruction. The white marked and enlarged area focuses on the aneurysm and includes an endoleak. Clearly, the endoleak is visible in panels A to C, but is harder to detect in the FBP reconstruction of the low-tube-voltage data. Figure 3 shows axial-tomographic images of a 62-year-old male patient with an aortic dissection. Panel A illustrates the mixture of both reconstructions, panel B is the IMBR reconstruction, and panel C is the FBP reconstruction. Note that for this patient, no preliminary examination was available. The effective dose for this acquisition was 2.32 mSv. The strongly eliminated noise enables the detection of the aortic dissection in panels A and B, while it is hard to detect in panel C.

Bottom Line: The effective dose level was, on average, 3.0 mSv for 80-kVp acquisitions.Low-tube-voltage CTAs significantly improve vascular contrast as presented by others; however, this effect in combination with IMBR enabled yet another substantial improvement of diagnostic quality.For IMBR, a significant improvement of image quality and a decreased radiation dose at low-tube-voltage can be reported.

View Article: PubMed Central - PubMed

Affiliation: Technische Universit√§t M√ľnchen , Department of Radiology, Munich 81675, Germany.

ABSTRACT
The objective of this study was to investigate the improvement in diagnostic quality of an iterative model-based reconstruction (IMBR) algorithm for low-tube-voltage (80-kVp) and low-tube-current in abdominal computed tomography angiography (CTA). A total of 11 patients were imaged on a 256-slice multidetector computed tomography for visualization of the aorta. For all patients, three different reconstructions from the low-tube-voltage data are generated: filtered backprojection (FBP), IMBR, and a mixture of both [Formula: see text]. To determine the diagnostic value of IMBR-based reconstructions, the image quality was assessed. With IMBR-based reconstructions, image noise could be significantly reduced, which was confirmed by a highly improved contrast-to-noise ratio. In the image quality assessment, radiologists were able to reliably detect more third-order and higher aortic branches in the IMBR reconstructions compared to FBP reconstructions. The effective dose level was, on average, 3.0 mSv for 80-kVp acquisitions. Low-tube-voltage CTAs significantly improve vascular contrast as presented by others; however, this effect in combination with IMBR enabled yet another substantial improvement of diagnostic quality. For IMBR, a significant improvement of image quality and a decreased radiation dose at low-tube-voltage can be reported.

No MeSH data available.


Related in: MedlinePlus