Mr. Paulo Domingues Domingues de Oliveira Profile

Paulo Domingues Domingues de Oliveira

at Univ de São Paulo

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 18 March 2008 Paper

Computational method for automatic determination of radiographic equipment anode angle

Marcelo A. Vieira, Paulo de Oliveira, Homero Schiabel

Proceedings Volume 6913, 69133M (2008) https://doi.org/10.1117/12.770942

KEYWORDS: X-rays, Point spread functions, Algorithm development, Image processing, X-ray imaging, Manufacturing, Image quality, Lead, Image analysis, Image filtering

Read Abstract +

This work presents a computational method for automatic determination of the anode angle of any radiographic equipment using a non-invasive method. The anode angle is a significant parameter of radiographic equipment, as it determines the focal spot size and the magnitude of the heel effect, which is directly related to the image quality. Even though it is an important parameter, it is not always provided by the x-ray equipment manufacturer. Besides, it is very difficult to be measured in practical quality assurance procedures. First, a pinhole matrix made of lead was built, which contains 33 radial 50μm diameter holes. This pinhole matrix is used to obtain a radiographic image of focal spot projections along the radiation field. The computer algorithm calculates the point spread function of each focal spot projection as well as the distance between them. Thus, the anode angle can be determined automatically by using the field characteristic, as the geometric unsharpness at any arbitrary field position can be derived from those at the central beam position. Results showed good accuracy compared to nominal values, and also a methodology was developed to validate the computational algorithm. Determination of anode angle of any radiographic equipment (including mammographic ones) with great precision can easily be done by using the method proposed in this work.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years