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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Related Experiment Video

Updated: Jun 28, 2026

The Microscopic Transcanal Approach in Stapes Surgery Revisited

The Microscopic Transcanal Approach in Stapes Surgery Revisited

Published on: February 16, 2022

Assessing stapes piston position using computed tomography: a cadaveric study.

Yoav Hahn¹, Rodney Diaz, Jonathan Hartman

¹Department of Otolaryngology-Head and Neck Surgery, University of California-Davis Medical Center, Sacramento, California 95817, USA.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|November 15, 2008

Summary

This summary is machine-generated.

Computed tomography (CT) scans overestimate stapes piston depth in post-stapedotomy patients, making them inaccurate for assessing vertigo causes. This study found CT unreliable for evaluating piston placement after stapes surgery.

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Last Updated: Jun 28, 2026

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Area of Science:

Otolaryngology
Medical Imaging
Surgical Outcomes

Background:

Persistent vertigo after stapedotomy may prompt CT scans to evaluate stapes piston depth.
Deep piston insertion is a known cause of vertigo, and CT is often used to assess this.
The diagnostic accuracy of CT for stapes piston position in this context is not well-established.

Purpose of the Study:

To determine the accuracy and precision of temporal bone CT scans in assessing stapes piston position post-stapedotomy.
To compare CT measurements of intravestibular piston depth with actual anatomic measurements.

Main Methods:

Stapedotomy was performed on 12 cadaver ears with stainless steel pistons.
Temporal bone CT scans were acquired using a fine-cut protocol.
Microscopic dissection allowed direct measurement of piston depth, which was compared to CT measurements.

Main Results:

CT consistently overestimated intravestibular piston depth compared to anatomic dissection.
The average overestimation was 0.53 mm for axial CT and 0.68 mm for coronal CT.
The degree of overestimation was inconsistent and greater with shallower piston placements.

Conclusions:

Standard temporal bone CT is neither accurate nor precise for evaluating stapes piston depth.
CT measurements of intravestibular piston depth are unreliable and tend to overstate the actual depth.
CT has limited value in diagnosing post-stapedectomy vertigo related to piston depth.