Metal implants on abdominal CT: does split-filter dual-energy CT provide additional value over iterative metal
Hildegard M Wichtmann1, Kai R Laukamp2, Sebastian Manneck1
1Clinic of Radiology and Nuclear Medicine, University Hospital Basel, University of Basel, Petersgraben 4, CH-4031, Basel, Switzerland.
Abdominal Radiology (New York)
|September 30, 2022
Summary
Split-filter dual-energy CT (sfDECT) with iterative metal artifact reduction (iMAR) is effective for abdominal imaging with hip or spinal implants. Mixed iMAR images offer the best overall quality, while low keV VMI with iMAR enhance vascular contrast.
Area of Science:
- Radiology
- Medical Imaging
- CT Technology
Background:
- Metal artifacts significantly degrade image quality in CT scans of patients with orthopedic implants.
- Split-filter dual-energy CT (sfDECT) and iterative metal artifact reduction (iMAR) algorithms are advanced techniques aimed at mitigating these artifacts.
Purpose of the Study:
- To evaluate the effectiveness of virtual monoenergetic images (VMI) and iMAR in reducing metal artifacts and improving image quality in abdominal sfDECT of patients with hip or spinal implants.
Main Methods:
- 102 abdominal sfDECT datasets from patients with hip (n=71) or spinal (n=31) implants were analyzed.
- Images were reconstructed using standard 120kVp-equivalent (Mixed) and VMI (40-190 keV) protocols, with and without iMAR.
- Quantitative artifact/noise levels and subjective image quality (overall, vascular contrast) were assessed by readers.
Main Results:
- The lowest quantitative artifact was observed in VMI190keV-iMAR, but not significantly lower than MixediMAR.
- MixediMAR images achieved the highest overall image quality ratings for both hip and spinal implants.
- VMI50keV-iMAR significantly improved vascular contrast compared to Mixed images and provided superior overall image quality for hip implants.
Conclusions:
- For abdominal sfDECT with hip or spinal implants, MixediMAR images are recommended for optimal overall image quality.
- High keV VMI do not offer additional image quality benefits over MixediMAR.
- iMAR enables the use of low keV VMI (e.g., VMI50keV) to enhance vascular contrast, offering a valuable alternative for specific diagnostic needs.
More Related Videos
Related Concept Videos
01:10Computed Tomography
4.9K
Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
4.9K
01:28Imaging Studies for Cardiovascular System V: CT
62
Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
62
01:27Imaging Studies III: Computed Tomography
39
DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
39
01:24X-ray Imaging
5.9K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
5.9K
01:14Imaging Studies I: CT and MRI
412
Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
412
01:17Ultrasonography
4.8K
Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
During an ultrasonography procedure, a handheld device called...
4.8K