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 hp
Sign In
Advertise with Us
GLOBETECH PUBLISHING LLC

Download Mobile App




X-ray Algorithm May Reduce Radiation Doses by Thousands-Fold

By MedImaging International staff writers
Posted on 21 Dec 2017
Print article
Image: A CT slice reconstruction of rabbit kitten lungs with absorption contrast CT at 0.16 m (a), Phase contrast CT at 2 m (b), and algorithm phase retrieval at 2 m (Photo courtesy of Monash University).
Image: A CT slice reconstruction of rabbit kitten lungs with absorption contrast CT at 0.16 m (a), Phase contrast CT at 2 m (b), and algorithm phase retrieval at 2 m (Photo courtesy of Monash University).
X-ray phase-contrast imaging (PCI) can improve the visibility of soft tissues by an order of magnitude or more compared to conventional radiographs, according to a new study.

Researchers at Monash University (Melbourne, Australia), the Japan Synchrotron Radiation Research Institute (JASRI; Sayo, Japan), and other institutions attempted to enhance image contrast by using phase shifts (refraction) of X-rays to increase signal-to-noise ratio (SNR) by up to two orders of magnitude--compared to conventional computerized tomography (CT) at the same radiation dose--and without loss of image quality. The results revealed that as radiation dose decreases, the relative improvement in SNR increases.

The researchers found that the enhancement can be traded for a reduction in dose greater than the square of the gain in SNR. Thus, reducing the dose by 300 fold resulted in the phase-retrieved SNR that was still almost 10 times larger than the absorption contrast data. According to the researchers, the potential for dose reduction factors in the tens of thousands without loss in image quality is possible, which would have a profound impact on medical and industrial imaging applications. The study was published on November 21, 2017, in Nature Scientific Reports.

“CT with high SNR and spatial resolution can potentially be achieved with less dose than a single projection-absorption based image. We therefore recommend using a large number of very low dose projections, coupled with phase retrieval before CT slice reconstruction,” concluded lead author Marcus Kitchen, PhD, of Monash University, and colleagues. “This will result in images with high SNR, retaining high spatial resolution, and minimizing any reconstruction artefacts due to insufficient CT projection angles.”

PCI is a general term for technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images. While standard X-ray imaging techniques such as CT rely on a decrease of the beam's intensity, in PCI the x-ray beam's phase shift is not measured directly, but is transformed into variations in intensity, which then can be recorded. When applied to samples that consist of elements with low atomic numbers, PCI is more sensitive to density variations than conventional transmission-based X-ray imaging, which leads to improved soft tissue contrast.

Related Links:
Monash University
Japan Synchrotron Radiation Research Institute
Portable Color Doppler Ultrasound System
S5000
Ultrasonic Pocket Doppler
SD1
New
Ultrasound Needle Guide
Ultra-Pro 3
New
MRI Infusion Workstation
BeneFusion MRI Station

Print article

Channels

MRI

view channel
Image: Comparison showing 3T and 7T scans for the same participant (Photo courtesy of P Simon Jones/University of Cambridge)

Ultra-Powerful MRI Scans Enable Life-Changing Surgery in Treatment-Resistant Epileptic Patients

Approximately 360,000 individuals in the UK suffer from focal epilepsy, a condition in which seizures spread from one part of the brain. Around a third of these patients experience persistent seizures... Read more

Ultrasound

view channel
Image: Oloid-shaped magnetic endoscope (Photo courtesy of STORM Lab/University of Leeds)

Tiny Magnetic Robot Takes 3D Scans from Deep Within Body

Colorectal cancer ranks as one of the leading causes of cancer-related mortality worldwide. However, when detected early, it is highly treatable. Now, a new minimally invasive technique could significantly... Read more

Imaging IT

view channel
Image: The new Medical Imaging Suite makes healthcare imaging data more accessible, interoperable and useful (Photo courtesy of Google Cloud)

New Google Cloud Medical Imaging Suite Makes Imaging Healthcare Data More Accessible

Medical imaging is a critical tool used to diagnose patients, and there are billions of medical images scanned globally each year. Imaging data accounts for about 90% of all healthcare data1 and, until... Read more
Copyright © 2000-2025 Globetech Media. All rights reserved.