The Effect of Computed Tomography Viewer Controls on Anatomical Measurements

Koehler, P. Ruben; Anderson, Robert E.; Baxter, Brent

doi:10.1148/130.1.189

Cited by 103 publications

(26 citation statements)

References 8 publications

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“…CT scans (Siemens DR2) were taken for evaluation of airway patency for diagnostic purposes. A fixed window level of 30 Hounsfield units was determined to emphasize soft tissue (Phelps et al, 1975;Koehler et al, 1979), and a window width of 210 Hounsfield units was used. These parameters were fixed for all subjects so that distortion of soft tissues and muscle outlines would be minimized.…”

Section: Methodsmentioning

confidence: 99%

Relationship Between Jaw Muscle Volume and Craniofacial Form

1989

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To study the relationship between craniofacial form and jaw muscle function, we evaluated 25 adult male subjects with Obstructive Sleep Apnea (age, 30-61 years; weight, 58-122 kg) on the basis of CT scans obtained for routine diagnostic purposes. All scans were obtained with the Frankfort horizontal plane at right angles to the floor; each CT slice was 8 mm thick. Masseter and medial pterygoid muscle outlines were traced, digitized, and stored, and three-dimensional reconstructions were made for calculation of muscle volume. Lateral cephalometric radiographs were analyzed for quantification of selected craniofacial variables. Significant correlations could not be identified between physiological apnea variables and jaw muscle volume. An intersubject variability in masseter muscle volume was identified (range, 22.4-38.1 cm3). Medial pterygoid muscle volume revealed more variability (range, 7.4-15.2 cm3). Masseter muscle volume had a negative correlation with mandibular plane and gonial angle, and a positive correlation with posterior face height, ramus height, posterior face length, condylar center to first molar point length, gonion to pterygomaxillary fissure length, and the ramus height/anterior face height ratio. Medial pterygoid muscle volume showed a positive correlation with posterior face height, ramus height, posterior face length, and the lengths between condylar center to first molar contact point, gonion to pterygomaxillary fissure, and antegonion to key ridge. Subjects with large masseter and medial pterygoid muscle volumes had flat mandibular and occlusal planes, and small gonial angles.

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Section: Methodsmentioning

confidence: 99%

Relationship Between Jaw Muscle Volume and Craniofacial Form

1989

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“…The accuracy of manual segmentation is limited by the dexterity, lassitude and fatigue of the observer. The manual adjustment of image contrast and the screen contrast can also influence the volume measured during manual segmentation [24], whereas automatic segmentation is independent of this setting.…”

Section: Discussionmentioning

confidence: 99%

Measurement of bone cyst fluid volume using k-means clustering

Docquier

Laurent

Menten

et al. 2009

Magnetic Resonance Imaging

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“…Intuitively determining the location of tissue interfaces may not only yield inaccurate results because the most esthetic image does not necessarily correspond to the best window setting for measurements (Koehler et al, 1979;Seibert et al, 19811, but also introduces precision (observer) errors. In contrast, the repeatability of HMH measurements from a particular scan on a fixed location is virtually loo%, as the position of the measurement points is entirely defined by the HMH CT numbers.…”

Section: Discussionmentioning

confidence: 99%

Linear measurements of cortical bone and dental enamel by computed tomography: Applications and problems

Spoor

Zonneveld

Macho

1993

American J Phys Anthropol

380

276

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This paper explores the potential of high-resolution computed tomography (CT) as a morphometric tool in paleoanthropology. The accuracy of linear measurements of enamel thickness and cortical bone thickness taken from CT scans is evaluated by making comparison with measurements taken directly from physical sections. The measurements of cortical bone are taken on extant and fossil specimens with and without attached matrix, and the dental specimens studied include a sample of 12 extant human molars. Local CT numbers (representing X-ray attenuation) are used to determine the exact position of the boundaries of a structure. Using this technique most studied dimensions, including four of human molar enamel thickness, could be obtained from CT scans with a maximum error range of +/- 0.1 mm. The limitations of the method are discussed with special reference to problems associated with highly mineralized fossils.

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The Effect of Computed Tomography Viewer Controls on Anatomical Measurements

Cited by 103 publications

References 8 publications

Relationship Between Jaw Muscle Volume and Craniofacial Form

Relationship Between Jaw Muscle Volume and Craniofacial Form

Measurement of bone cyst fluid volume using k-means clustering

Linear measurements of cortical bone and dental enamel by computed tomography: Applications and problems

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