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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...

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Related Experiment Video

Updated: Apr 5, 2026

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

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Published on: May 7, 2021

Technical Performance of Universal and Enhanced Intraoral Imaging Rectangular Collimators.

K Brandon Johnson, Sally M Mauriello, John B Ludlow

Journal of Dental Hygiene : JDH

|August 26, 2015

Summary

The enhanced rectangular collimator reduced technical errors and exposure time, though it increased patient dose due to a larger exposure area. Radiographers preferred this device for its ease of use.

Keywords:

collimator cut cone cut intraoral radiograph intraoral radiographic technique errors rectangular collimator tru-align rectangular collimator

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Area of Science:

Dental Radiology
Medical Imaging Technology

Background:

Rectangular collimators are crucial for reducing radiation exposure and improving image quality in dental radiography.
Comparing the performance of different collimator designs is essential for optimizing clinical practice.

Purpose of the Study:

To compare technical errors, time efficiency, and radiographer preference between two rectangular collimators: Tru-Align™ (enhanced) and Rinn® (universal).

Main Methods:

Seventeen subjects exposed an 18-projection full mouth series (FMX) using both collimator devices with digital sensors on a manikin.
A survey assessed ease of use, time, and preference. Data were analyzed using statistical methods including paired t-test and ANOVA.

Main Results:

The enhanced device resulted in fewer mean technique errors (9.7 vs 12.1) and significantly less collimator centering errors.
Diagnostically unacceptable error rates were similar (Enhanced=2.9 vs Universal=3.2).
94% of subjects preferred the enhanced device, finding it easier to use and requiring less time (4 min vs. unspecified for universal).

Conclusions:

The enhanced collimator improves efficiency and reduces centering errors for diagnostically acceptable radiographs.
However, it increases the exposure area by 35%, leading to a higher patient radiation dose.