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Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
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Related Experiment Video

Updated: Sep 18, 2025

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Published on: December 15, 2014

Local Diagnostic Reference Levels in Digital Breast Tomosynthesis.

Peter Barnes¹, Michelle Kostidis¹, Julie Nguyen¹

¹Austin Health, Repatriation Hospital Campus, Heidelberg, Victoria, Australia.

Journal of Medical Radiation Sciences

|June 25, 2025

Summary

This summary is machine-generated.

Local Diagnostic Reference Levels (LDRLs) for Digital Breast Tomosynthesis Mammography (DBT) were established using compressed breast thickness (CBT). CBT significantly impacts radiation dose, necessitating tailored LDRLs for optimal patient safety and quality assurance in mammography.

Keywords:

compression diagnostic reference level (DRL)digital breast tomosynthesis (DBT)local diagnostic reference level (LDRL)mammography

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Expedited Radiation Biodosimetry by Automated Dicentric Chromosome Identification ADCI and Dose Estimation

Expedited Radiation Biodosimetry by Automated Dicentric Chromosome Identification ADCI and Dose Estimation

Published on: September 4, 2017

Area of Science:

Medical Imaging
Radiology
Health Physics

Background:

Diagnostic Reference Levels (DRLs) guide radiation exposure in medical procedures.
Australia currently lacks national DRLs for Digital Breast Tomosynthesis Mammography (DBT).
Establishing DRLs for DBT is crucial due to breast tissue radiosensitivity.

Purpose of the Study:

Develop Local Diagnostic Reference Levels (LDRLs) for DBT in Australia.
Provide a guideline for monitoring radiation delivery in DBT procedures.
Create a Quality Assurance tool for mammography unit performance.

Main Methods:

Collected Average Glandular Dose (AGD) data via OpenREM software.
Recorded breast density, compression force, and compressed breast thickness (CBT).
Calculated LDRLs using the 75th percentile of AGD, categorized by CBT ranges.

Main Results:

LDRLs were consistent across craniocaudal and mediolateral oblique views.
Calculated LDRLs for CBT ranges (13-49mm, 50-74mm, 75-99mm, 100-118mm) were 1.5, 2.70, 3.90, and 4.70 mGy.
No significant correlation was found between breast density and AGD.

Conclusions:

Compressed breast thickness (CBT) has a greater impact on radiation dose than breast density.
Significant variations in LDRLs across CBT ranges indicate a single LDRL may be inadequate.
Regular review of LDRLs is essential for maintaining optimal patient radiation doses.