Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 5106
  Title Gray scale range and the marking of vertebral coordinates on digitized radiographic images
Journal J Manipulative Physiol Ther. 1994 Jul-Aug;17(6):359-363
Peer Review Yes
Publication Type Article

OBJECTIVE: To determine the relationship between X-ray image quality as reflected by the gray scale range and the reliability of measuring intervertebral angles.

DESIGN: Intrarater reliability evaluation.

SETTING: Image processing laboratory.

PATIENTS: Digitized images of fluoroscopic AP lumbar motion sequences obtained from eight patients.

INTERVENTION: Ten consecutive measurements of a single intervertebral angle in each subject related to gray scale range and midpoint gray level. The results were compared to measurements from an osseous lumbar spine calibration model.

MAIN OUTCOME MEASURES: Variance of intervertebral angles in relation to gray scale range and midpoint level.

RESULTS: No relationship was found between reliability of intervertebral angles and image parameters.

CONCLUSION: For radiographs of diagnostic quality the gray scale range and midpoint level over the area of interest does not affect the reliability of coordinate marking.

This abstract is reproduced with the permission of the publisher. Article only available in print.


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