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Measurement Techniques
Terminology
Radiographic measurement techniques, skull base craniometry, skull base lines
Pathology-based Imaging Issues
This chapter provides a broad summary of the varied measurement techniques used to evaluate the spine. The main focus for the reader should be the tables and the multiple schematics that define the variously named lines and angles. These summarize the classic measurement techniques for the skull base and rheumatoid disease as well as some of the most commonly used measurements for trauma assessment. The rest of the measurements defined below are a mixture of miscellaneous measurements and those that do not translate well into a table (i.e., equations).
Torg-Pavlov Ratio
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Diameter of canal to width of vertebral body (initially defined on plain radiographs of subaxial spine)
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Utility is controversial; < 0.80 as seen on lateral view considered to be cervical stenosis, such small canal potentially increases risk for cord injury
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