Related Experiment Video
Updated: Feb 16, 2026
10:24
Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
2.8K
Computed Radiography Photostimulable Phosphor Plate Receptors: Effect on Grid Conversion Factors
Radiologic Technology
|January 5, 2018
Summary
Analog grid conversion factors are not directly applicable to digital radiography systems like photostimulable phosphor (PSP) plates. Using them can lead to overexposure, necessitating system-specific calibration for optimal patient radiation dose and image quality.
Area of Science:
- Medical Imaging
- Radiologic Technology
- Digital Radiography
Background:
- Traditional grid conversion factors were developed for film-screen systems.
- Physics principles suggest these factors may not translate to digital imaging receptors.
- This raises concerns about their applicability in modern computed radiography.
Purpose of the Study:
- To evaluate the relationship between analog grid conversion factors and photostimulable phosphor (PSP) plate receptor systems.
- To assess the impact of various grid ratios on exposure indicators with PSP technology.
Main Methods:
- Conducted three experiments using computed radiography with a PSP receptor.
- Utilized a range of grid ratios (6:1, 8:1, 12:1).
- Assessed the effect of analog grid conversion factors on exposure indicators at constant peak kilovoltage (kVp).
Main Results:
- Using established analog grid conversion factors with a PSP receptor resulted in overexposure.
- Exposure indicators were outside acceptable diagnostic limits when analog factors were applied.
- This indicates a discrepancy between analog grid factors and digital receptor performance.
Conclusions:
- Radiologic technologist literature must contextualize antiscatter grid use with specific receptor types and digital systems.
- Technologists need to understand these differences to optimize grid use and minimize patient radiation dose.
- Radiology departments should develop calibrated grid conversions tailored to their digital systems and image quality preferences.
Related Concept Videos
02:08Gene Conversion
10.7K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
10.7K
02:08Gene Conversion
3.1K
3.1K
01:36Conversion of Units
37.3K
Sometimes, there is a need to convert from one unit to another one. For instance, reading a cookbook in which quantities are expressed in units of liters or ounces may require conversion of quantities to cups. Or, when looking up directions on how to get to a location, we may be interested to know how many miles we are going to walk. In this case, we would have to convert units of feet or meters to miles.
The first step in the unit conversion is to list the given units and the units required...
The first step in the unit conversion is to list the given units and the units required...
37.3K
04:01Factors Affecting Solubility
37.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
37.4K
01:31Internal Receptors
74.8K
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
74.8K
02:16Transcription Factors
82.9K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
82.9K