Intrafilm controls to standardize grey level variations in digitized radiographs

Dento Maxillo Facial Radiology
M K ShroutC F Hildebolt

Abstract

Radiometric analysis can be used to identify small changes in grey levels taken from investigator-defined regions of interest (ROIs). To do this, standardization of the radiographic optical densities and image grey scales is considered essential. Rigid standardization is one of the impediments to applying existing radiometric techniques to clinical practice. The purpose of this study was to evaluate the use of grey-level variations from a series of intrafilm control regions of interest (ROIs) to adjust radiometric grey-level data taken from test ROIs. After digitization, ROIs were drawn on three locations: the background, anatomical crown, and tooth root. Mean grey levels, histograms and cumulative percent histograms (CPHs) were determined for each group. With the goal of decreasing the distribution of these curves from their unadjusted grey-level positions to zero (superimposing all curves), shifts required to align the control CPHs were applied to test CPHs. Changes between the pre- and post-adjusted CPH distributions were measured. Intrafilm controls provided a combined decrease of 45.3% in the grey-level distribution error. While CPHs can be adjusted using intrafilm controls, these adjustments may have limited benefit.

References

Jun 1, 1992·Oral Surgery, Oral Medicine, and Oral Pathology·K A Southard, T E Southard
Sep 11, 1992·Journal of Dental Research·C F HildeboltM J Gravier
Feb 1, 1990·Endodontics & Dental Traumatology·D OrstavikK Kerekes
Nov 1, 1990·Oral Surgery, Oral Medicine, and Oral Pathology·C F HildeboltM K Shrout
Sep 1, 1986·Journal of Periodontal Research·U E RuttimannE Schmidt
Jul 1, 1988·Journal of Periodontal Research·M OhkiN Yamada
Jul 1, 1983·Journal of Periodontology·J E DuckworthS S Socransky
Oct 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·M K ShroutM W Vannier
Oct 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·M K ShroutM W Vannier
Sep 1, 1993·Journal of Clinical Periodontology·M K ShroutN M Ahmed
May 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·M K ShroutM W Vannier
Feb 1, 1993·Dento Maxillo Facial Radiology·M K ShroutM W Vannier

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.