Gray scale range and the marking of vertebral coordinates on digitized radiographic images.
Authors: Thorkeldsen, A. and Breen, A.C.
Journal: J Manipulative Physiol Ther
Volume: 17
Issue: 6
Pages: 359-363
ISSN: 0161-4754
Abstract: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.
Source: PubMed
GRAY-SCALE RANGE AND THE MARKING OF VERTEBRAL COORDINATES ON DIGITIZED RADIOGRAPHIC IMAGES
Authors: THORKELDSEN, A. and BREEN, A.C.
Journal: JOURNAL OF MANIPULATIVE AND PHYSIOLOGICAL THERAPEUTICS
Volume: 17
Issue: 6
Pages: 359-363
ISSN: 0161-4754
Source: Web of Science (Lite)
Gray scale range and the marking of vertebral coordinates on digitized radiographic images.
Authors: Thorkeldsen, A. and Breen, A.C.
Journal: Journal of manipulative and physiological therapeutics
Volume: 17
Issue: 6
Pages: 359-363
eISSN: 1532-6586
ISSN: 0161-4754
Abstract: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.Source: Europe PubMed Central