We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

Features Partner Sites Information LinkXpress
Sign In
Advertise with Us
CIRS

Download Mobile App




Events

ATTENTION: Due to the COVID-19 PANDEMIC, many events are being rescheduled for a later date, converted into virtual venues, or altogether cancelled. Please check with the event organizer or website prior to planning for any forthcoming event.

Novel Technique Reduces Angiography Radiation Exposure

By MedImaging International staff writers
Posted on 19 Jan 2022
Print article
Image: A visual comparison of DSA (L) and DVA (R) (Photo courtesy of RSNA)
Image: A visual comparison of DSA (L) and DVA (R) (Photo courtesy of RSNA)
A new x-ray image processing technique can improve standard angiography contrast-to-noise ratio (CNR) while reducing patient risk, according to a new study.

Developed at Goethe University Hospital (KGU; Frankfurt am Main, Germany), digital variance angiography (DVA) uses the same raw series of x-ray images acquired in digital subtraction angiography (DSA), but instead of subtracting the pre-contrast image from the series, DVA applies an algorithm that calculates the variance of each pixel intensity in the series. BY doing so, DVA provides a visual kinetic image of contrast agent distribution in the blood vessels.

To test DVA, the researchers conducted a study in 37 patients (42-82 years of age) who underwent prostatic artery embolization (PAE) at KGU from May to October of 2020. In all, 142 acquisitions were included in the analysis, and DSA and DVA images were generated from the same raw series. Color image processing was added to enhance visualization of the contrast media according to the color spectrum of visible light and calculated CNR values. Three readers evaluated image quality in a randomized blinded survey, using a five-grade-Likert-scale.

The results revealed that the DVA images generated provided 4.1 times higher CNR than the DSA images; the median contrast-to-noise values were 29.5 for DVA and 7.2 for DSA. The DVA images also received significantly higher Likert scores (median value of 4.33) than the DSA images, with a median value of 3.67. The researchers also found DVA could significantly reduce radiation exposure and the amount of iodinated contrast agent required. The study was presented at the RSNA annual meeting, held during November 2021 in Chicago (IL, USA).

“Prostatic artery embolizations require long procedure times and large doses of fluoroscopy contrast agents. The quality reserve of DVA might provide an opportunity for the reduction of radiation exposure and iodinated contrast media,” said study presenter Leona Alizadeh, of the KGU Institute of Diagnostic and Interventional Radiology. “The data in this initial retrospective trial indicate that DVA has significantly higher CNR and enhanced image quality compared to DSA in prostatic artery embolization procedures.”

The PAE procedure blocks the blood flow to the areas of the prostate that are most affected by benign prostatic hyperplasia (BPH), resulting in necrosis and causing the prostate to initially be softer, alleviating some of the pressure that is causing blockage of the urine. Over several months, the body’s immune system reabsorbs the dead tissue and shrinkage of the prostate. Over a six- month period, the prostate will shrink by 20-40%, resulting in improved and less frequent urination.

Related Links:
Goethe University Hospital


Print article
Radcal
Sun Nuclear

Channels

MRI

view channel
Image: DWI for detection of locally recurrent pancreatic cancer (Photo courtesy of Pexels)

Adding DWI to Conventional MRI Improves Detection of Locally Recurrent Pancreatic Cancer

A new study has found that adding diffusion-weighted MRI (DWI) to conventional MRI improves the differentiation of locally recurrent tumor and post-surgical fibrosis after pancreatic ductal adenocarcinoma... Read more

Ultrasound

view channel
Image: Resona I9 ultrasound system features innovative design elements (Photo courtesy of Mindray)

Mindray’s Latest Resona I9 Ultrasound System Provides Innovation-Driven Experience

Mindray (Shenzhen, China) has launched a new ultrasound system which provides an entirely new experience, driven by innovation to address today’s clinical challenges. Mindray’s latest Resona I9 ultrasound... Read more

Imaging IT

view channel
Illustration

Global AI in Medical Diagnostics Market to Be Driven by Demand for Image Recognition in Radiology

The global artificial intelligence (AI) in medical diagnostics market is expanding with early disease detection being one of its key applications and image recognition becoming a compelling consumer proposition... Read more

Industry News

view channel
Image: Global diagnostic imaging market is driven by technological advancements (Photo courtesy of Pexels)

Global Diagnostic Imaging Market to Surpass USD 33 Billion by 2026

The global diagnostic imaging market is one of the most critical segments of the healthcare sector. Medical imaging helps in early detection and diagnosis of diseases at a stage when they can be easily... Read more
Copyright © 2000-2022 Globetech Media. All rights reserved.