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High precision semiautomated computed tomography measurement of lumbar disk and vertebral heights
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10.1118/1.4769412
/content/aapm/journal/medphys/40/1/10.1118/1.4769412
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/1/10.1118/1.4769412

Figures

Image of FIG. 1.
FIG. 1.

Overview of the complete computer algorithm. In (e) the right hand side of the top vertebral surface was cut out to allow a lateral view inside the vertebral body (g).

Image of FIG. 2.
FIG. 2.

New seeding technique. (a) Flat-area vertices. (b) Flat-area vertices on regions of the surface oriented more horizontally that vertically. (c) New seed. (d) Seed obtained with the previous algorithm. Results after 30 iterations for (e) the new seed and (f) the previous seed.

Image of FIG. 3.
FIG. 3.

Anterior, middle, and posterior areas for local height measure. The larger points represent the anterior, middle, and posterior points.

Image of FIG. 4.
FIG. 4.

Manual measurement of local vertebral heights (left) and local disk heights (right) on the mid-sagittal plane.

Image of FIG. 5.
FIG. 5.

Bland-Altman plots for vertebral heights, stratified by scanner and resolution.

Image of FIG. 6.
FIG. 6.

Bland-Altman plots for disk heights, stratified by scanner and resolution.

Image of FIG. 7.
FIG. 7.

Gaussian noise added to (a) the original image to simulate scanning with lower current levels of (b) 200, (c) 100, and (d) 50 mAs. The current level in the original image is 300 mAs.

Image of FIG. 8.
FIG. 8.

Precision of the algorithm in the presence of added Gaussian noise simulating lower current levels. The current level in the original image is 300 mAs.

Image of FIG. 9.
FIG. 9.

Mean differences between height measurements with no added noise and with added Gaussian noise simulating lower current levels. Error bars represent the standard deviations. The current level in the original image is 300 mAs.

Image of FIG. 10.
FIG. 10.

Correlation between manual measures and computed measures for local vertebral and disk heights.

Tables

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TABLE I.

Precision of vertebral height measurements.

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TABLE II.

Precision of disk height measurements.

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TABLE III.

Intraoperator and interoperator variability and agreement.

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TABLE IV.

Precision of local vertebral height measurements.

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TABLE V.

Precision of local disk height measurements.

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TABLE VI.

Comparison between the precision of the vertebral height measurements obtained with the computer algorithm and a manual mid-sagittal method.

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TABLE VII.

Comparison between the precision of the disk height measurements obtained with the computer algorithm and a manual mid-sagittal method.

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TABLE VIII.

Difference between manual and automated local mid-sagittal vertebral height measurements.

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TABLE IX.

Difference between manual and automated local mid-sagittal disk height measurements.

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/content/aapm/journal/medphys/40/1/10.1118/1.4769412
2012-12-18
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High precision semiautomated computed tomography measurement of lumbar disk and vertebral heights
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/1/10.1118/1.4769412
10.1118/1.4769412
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