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Non-fluoroscopic Catheter Tracking for Fluoroscopy Reduction in Interventional Electrophysiology

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Needle artifact reduction during interventional CT procedures using a silver filter.

Carlos A Reynoso-Mejia¹, Jonathan Troville², Martin G Wagner^1,2

¹Department of Radiology, University of Wisconsin-Madison, Madison, WI, 53705, USA.

BMC Biomedical Engineering

|March 12, 2024

Summary

This summary is machine-generated.

A silver (Ag) filter in Multidetector Computed Tomography (MDCT) significantly reduces metal artifacts from biopsy needles without increasing scan time or image noise. This improves visualization of target anatomy during interventional imaging.

Keywords:

CT artifact CT filter Interventional CT

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Area of Science:

Medical Imaging
Radiology
Interventional Procedures

Background:

Metal artifacts (MAR) in interventional imaging are a significant challenge, often limiting the utility of advanced algorithms due to computational demands.
Beam hardening filters offer a potential solution by mitigating artifacts without increasing processing time.
A 0.5 mm silver (Ag) filter was investigated for its efficacy in reducing metal artifacts during CT-guided biopsy.

Purpose of the Study:

To evaluate the effectiveness of a 0.5 mm Ag filter in reducing metal artifacts in Multidetector Computed Tomography (MDCT) during CT-guided biopsy procedures.
To assess the impact of the Ag filter on artifact range, width, CT number accuracy, and image noise.

Main Methods:

CT acquisitions were performed on an anthropomorphic lung phantom using varying beam energies (100, 120, 135 kV) and a 120 kV setting with a 0.5 mm Ag filter.
Filtered back projection reconstruction was employed with constant CTDIvol (1 mGy).
Quantitative analysis of artifact metrics (FWHM, FWTM, width at -100 HU, absolute error) and image noise was conducted, with statistical analysis using ANOVA.

Main Results:

The 120 kV Ag filter demonstrated the shortest artifact range.
Significant reductions were observed in CT number drop (-53.6% for needle tip, -48.7% for trajectory) and artifact width (-34.7%) compared to the 120 kV reference.
Blooming artifacts (FWHM, FWTM) were reduced by -14.2% and -53.3% respectively, with no significant increase in image noise (p > 0.05).

Conclusions:

A 0.5 mm Ag filter effectively reduces metal artifacts caused by biopsy needles in MDCT.
This artifact reduction can enhance the visualization of target lesions and surrounding structures.
The use of the Ag filter maintains diagnostic image quality without increasing image noise.