News | October 24, 2014

ASTM International Standard Aids in Measurement of X-Ray Focal Point Size

 X-Ray system_from Carestream Image acquisition software

October 24, 2014 — The quality and resolution of X-ray images depends on the characteristics of the focal point, the area that is struck by electrons and from which the resulting X-rays are emitted. A new ASTM International standard will allow users to determine the effective focal spot size of an X-ray source.

The new standard is ASTM E2903, Test Method for Measurement of the Effective Focal Spot Size of Mini and Micro Focus X-ray Tubes. X-ray tube manufacturers will find the standard helpful when supplying customers with focal spot size, or for quality control.

Additionally, “knowledge of focal spot size is very important to practitioners of digital radiography because magnification principles need to be applied to compensate for the limited spatial resolution of digital X-ray image detectors,” said ASTM member David Fry, research and development engineer, Los Alamos National Laboratory. 

Fry explains that, in radiography, the blurring of image edges is a function of the geometry of the setup and the focal spot size.

“Digital images are also blurred by the pixel size and X-ray to light conversion screens,” Fry said. “Digital images are thus blurred by combination of focal spot size, geometry and digital detector characteristics.”

Results generated from the use of ASTM E2903 can be used to establish source-to-object and object-to-image detector distances appropriate for maintaining the desired degree of geometric unsharpness or maximum magnification possible, or both, for a given radiographic imaging application. ASTM standard practices E2698 and E2033 for radiographic examination using digital methods require knowledge of focal spot size.

ASTM E2903 was developed by Subcommittee E07.01 on Radiology (X and Gamma) Method, part of ASTM Committee E07 on Nondestructive Testing. E07.01 encourages all interested parties to participate in its standards-developing activities. The subcommittee is particularly interested in feedback on how ASTM E2903 is being applied, as well as additional data for refinement of the standard’s precision and bias statement.

For more information: www.astm.org

Related Content

Philips Showcases Integrated Solutions for Cardiovascular Care at TCT 2018
News | Cardiac Imaging | September 20, 2018
At the Transcatheter Cardiovascular Therapeutics (TCT) annual meeting, Sept. 21–25 in San Diego, Philips is showcasing...
SimonMed Deploys ClearRead CT Enterprise Wide
News | Computer-Aided Detection Software | September 17, 2018
September 17, 2018 — National outpatient physician radiology group SimonMed Imaging has selected Riverain Technologie
Agfa Brings Intelligent Radiography to RSNA 2018
News | Digital Radiography (DR) | September 17, 2018
September 17, 2018 — At the 2018 Radiological Society of North America (RSNA) annual meeting, Nov.
Siemens Healthineers Announces First U.S. Install of Somatom go.Top CT
News | Computed Tomography (CT) | September 17, 2018
September 17, 2018 — The Ohio State University Wexner Medical Center in Columbus recently became the first healthcare
The DRX-Transportable System/Lite
News | X-Ray | September 12, 2018
Columbus Regional Health (Columbus, Ind.) has deployed a Carestream ...
The CT scanner might not come with protocols that are adequate for each hospital situation, so at Phoenix Children’s Hospital they designed their own protocols, said Dianna Bardo, M.D., director of body MR and co-director of the 3D Innovation Lab at Phoenix Children’s.

The CT scanner might not come with protocols that are adequate for each hospital situation, so at Phoenix Children’s Hospital they designed their own protocols, said Dianna Bardo, M.D., director of body MR and co-director of the 3D Innovation Lab at Phoenix Children’s.

Sponsored Content | Case Study | Radiation Dose Management | September 07, 2018
Radiation dose management is central to child patient safety. Medical imaging plays an increasing role in the accurate...
Mount Sinai Serves as Official Medical Services Provider for 2018 U.S. Open
News | Orthopedic Imaging | September 06, 2018
For the sixth consecutive year, Mount Sinai will serve as the official medical services provider for the 2018 U.S. Open...
Carestream Releases Second-Generation Metal Artifact Reduction Software for OnSight 3D Extremity System
Technology | Computed Tomography (CT) | September 06, 2018
Carestream Health has started shipping a new software version for its Carestream OnSight 3D Extremity System that...

Image courtesy of Siemens Healthineers

Feature | CT Angiography (CTA) | September 06, 2018 | Dave Fornell
There have been a few big, recent advancements in cardiac computed tomography angiography (CCTA) imaging technology....
Key Patient Preparations for a CT Scan
News | Computed Tomography (CT) | September 05, 2018
The Center for Diagnostic Imaging (CDI) in Miami recently released a list of important preparations patients should...