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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...

X-ray Imaging

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

Imaging Studies III: Computed Tomography

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

Radiological Investigation I: X-ray and CT

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...

Imaging Studies I: CT and MRI

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...

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Related Experiment Video

Updated: May 9, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Published on: May 7, 2021

Computed tomography x-ray tube life analysis: a multiyear study.

Yusuf Emre Erdi¹

¹Diagnostic X-Ray Quality Assurance Section, Department of Medical Physics, at Memorial Sloan-Kettering Cancer Center, New York City, USA.

Radiologic Technology

|July 18, 2013

Summary

Computed tomography (CT) x-ray tube life often exceeds manufacturer warranty limits, especially for Pro tubes. Understanding tube life is key to reducing CT scanner operating costs.

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Last Updated: May 9, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Published on: May 7, 2021

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

Published on: April 13, 2016

Area of Science:

Medical Imaging Technology
Radiology
Healthcare Operations

Background:

Computed tomography (CT) scanners are essential diagnostic tools.
X-ray tube longevity directly impacts operational costs and efficiency.
Manufacturer warranties provide coverage limits that may not reflect actual tube performance.

Purpose of the Study:

To compare the actual lifespan of CT x-ray tubes against manufacturer warranty limits.
To identify factors influencing CT x-ray tube life and potential cost savings.

Main Methods:

Analysis of log files from GE LightSpeed and GE VCT CT scanners over six years.
Tracking 40 Performix Ultra and 10 Performix Pro CT x-ray tube replacements.
Measurement of CT x-ray tube life in months and kiloelectronvolt-seconds (kAs) or examinations.

Main Results:

Performix Ultra tubes had a warranty of 70 kAs or 12 months; actual life ranged from 7-48 months (mean 19.2 months, 81.0 kAs).
Seven Ultra tubes failed to meet warranty limits.
Performix Pro tubes had a warranty of 6000 examinations or 12 months; all 10 exceeded warranty (mean 22.4 months).
Pro tubes lasted longer but acquired fewer scans than Ultra tubes.

Conclusions:

CT x-ray tube life can exceed warranty coverage, particularly for Pro models.
Variability in clinical demand, mechanical, environmental, and usage factors influence tube lifespan.
Optimizing CT scanner operation based on actual tube performance can lower costs.