1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
An automatic and accurate x-ray tube focal spot/grid alignment system for mobile radiography: System description and alignment accuracya)
a)The AGAS is protected by U.S. Patent Nos. 6,702,459, 7,581,884, and 7,798,710, which have been issued to the co-authors of this paper.
Rent:
Rent this article for
USD
10.1118/1.3518085
/content/aapm/journal/medphys/37/12/10.1118/1.3518085
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/12/10.1118/1.3518085

Figures

Image of FIG. 1.
FIG. 1.

The AMX- modified with the AGA system. The modifications shown are (a) camera and LED lamp array housing mounted in front of the collimator, (b) grid tunnel mounted on the cassette bin door, (c) alignment button mounted on the side of the collimator, (d) optical target arm mounted on the top of the horizontal extension arm, and (e) housing for vertical drive motor.

Image of FIG. 2.
FIG. 2.

The custom grid tunnel with the target arm attached to the left dock. The arm may be attached to either the left or right dock by the technologist as desired.

Image of FIG. 3.
FIG. 3.

Schematic showing major electrical subsystems and components of the AGA system. All components shown are added except the three components in the AMX- box.

Image of FIG. 4.
FIG. 4.

Images of the optical target captured from the video camera: (a) Background image (LED array off), (b) foreground image (LED array on), and (c) background-corrected image. Note that a ball of crumpled aluminum foil used as a distracter for these pictures is visible near the center of (a) and (b) but not in (c).

Image of FIG. 5.
FIG. 5.

Camera calibration jig. The camera is positioned a known distance above a grid of dots spaced by 1 cm. The larger central dot identifies the center of the reference plane.

Image of FIG. 6.
FIG. 6.

Radiographic alignment jig. The upper and lower plates contain radio-opaque objects; the positions of these objects in the acquired image are analyzed to determine the location of the focal spot.

Image of FIG. 7.
FIG. 7.

Accuracy of camera position measurements for different focal spot positions. The vertical axis is the difference between the focal spot positions determined by camera measurement and by radiographic measurement. The horizontal axis is the radiographic position measurement.

Image of FIG. 8.
FIG. 8.

Clinical chest images of a patient acquired 12–24 h apart (a) without a grid and (b) with 15:1 grid aligned using AGAS.

Tables

Generic image for table
TABLE I.

Results of laboratory test comparing manual and automatic alignment. The alignment error is calculated from the optical measurement of the relative positions of the collimator and the optical target.

Generic image for table
TABLE II.

Accuracy of camera measurements of the focal spot position.

Generic image for table
TABLE III.

Results of laboratory test of automatic alignment. The alignment error is calculated from radiographic measurements of the focal spot position.

Generic image for table
TABLE IV.

Accuracy of clinical alignment over 23 alignment procedures. The alignment error is calculated from optical measurements of the focal spot position.

Loading

Article metrics loading...

/content/aapm/journal/medphys/37/12/10.1118/1.3518085
2010-11-23
2014-04-23
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An automatic and accurate x-ray tube focal spot/grid alignment system for mobile radiography: System description and alignment accuracya)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/12/10.1118/1.3518085
10.1118/1.3518085
SEARCH_EXPAND_ITEM