Related Experiment Video
Updated: Aug 20, 2025
05:22
Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists
Published on: August 11, 2023
2.1K
DECT Numbers in Upper Abdominal Organs for Differential Diagnosis: A Feasibility Study
Fumihito Toshima1, Norihide Yoneda1, Kanako Terada1
1Department of Radiology, Kanazawa University Graduate School of Medical Sciences, 13-1, Takara-Machi, Kanazawa 920-8641, Ishikawa, Japan.
Tomography (Ann Arbor, Mich.)
|November 22, 2022
Summary
Dual-energy CT (DECT) numbers can assess lesion similarity. This study found minimal DECT number variation within organs, suggesting it can help differentiate lesions using quantitative imaging analysis.
Area of Science:
- Radiology
- Medical Imaging
- Quantitative Imaging
Background:
- Assessing similarity between primary and metastatic lesions using dual-energy computed tomography (DECT) numbers is valuable.
- Current criteria for DECT number similarity are unclear, hindering clinical application.
Purpose of the Study:
- To investigate DECT number variations within upper abdominal organs.
- To establish standards for DECT number similarity based on intra-organ variability.
- To evaluate DECT parameters for distinguishing between organs.
Main Methods:
- Retrospective analysis of hepatic protocol DECT scans from 30 patients.
- Collection of DECT numbers for 70 keV, 40 keV CT values, slope, effective Z, iodine, and water concentration.
- Assessment of DECT number agreement within the liver, spleen, and kidney using Bland-Altman analysis.
- Evaluation of diagnostic ability using receiver operating characteristic analysis.
Main Results:
- Narrowest 95% limits of agreement within the same organ were observed on delayed phase (DP) CT for slope, effective Z, iodine, and water concentration.
- High diagnostic ability was achieved using DECT number differences on portal venous (PVP) and DP images (AUC of DP: 0.987-0.999).
Conclusions:
- Intra-organ DECT number variability can serve as a criterion for similarity.
- This approach may aid in differential diagnosis by comparing DECT numbers of different entities.
- Quantitative DECT analysis offers potential for improved lesion characterization.
Related Concept Videos
01:25Assessment of the Abdomen I: Inspection and Auscultation
577
Introduction
The abdominal examination is a cornerstone of clinical medicine, serving as a critical tool in diagnosing various gastrointestinal (GI) diseases. It involves a systematic approach that includes inspection and auscultation, each with distinct yet complementary roles in assessing the abdomen. This article will delve into these two primary methods healthcare professionals use to examine the abdomen.
Inspection of the Abdomen
The first step in any abdominal examination is inspection....
The abdominal examination is a cornerstone of clinical medicine, serving as a critical tool in diagnosing various gastrointestinal (GI) diseases. It involves a systematic approach that includes inspection and auscultation, each with distinct yet complementary roles in assessing the abdomen. This article will delve into these two primary methods healthcare professionals use to examine the abdomen.
Inspection of the Abdomen
The first step in any abdominal examination is inspection....
577
01:19Abdominal Regions and Quadrants
9.5K
To promote clear communication, for instance, about the location of a patient's abdominal pain or a suspicious mass, anatomists and clinicians typically use imaginary lines to categorize the abdominopelvic cavity into either four quadrants or nine regions to identify organs in the cavity.
The simpler quadrants approach, which is more commonly used in medicine, subdivides the cavity with one horizontal and one vertical line that intersects at the patient's umbilicus (navel). The four...
The simpler quadrants approach, which is more commonly used in medicine, subdivides the cavity with one horizontal and one vertical line that intersects at the patient's umbilicus (navel). The four...
9.5K
01:18Assessment of the Abdomen II: Percussion
493
Percussion is a fundamental technique used to assess the liver, spleen, and abdominal organs by tapping the abdomen and interpreting the resulting sounds. This method helps identify fluid, distention, and masses through variations in sound, such as the high-pitched tympany of air-filled areas and the dullness of solid masses. Understanding how to percuss these organs provides valuable information for healthcare professionals in diagnosing conditions early.
Percussion
Percussion is an essential...
Percussion
Percussion is an essential...
493
01:23Assessment of the Abdomen III: Palpation
999
Palpation is a crucial tactile examination method for assessing abdominal organs and detecting conditions like tenderness, distention, masses, or fluid. It involves both light and deep palpation techniques, each serving specific diagnostic purposes. Light palpation helps identify tenderness and other surface-level indicators, while deep palpation locates and assess abdominal masses and organ boundaries. A skilled professional can gather valuable insights through palpation, including evaluating...
999
01:25Assessment of the Rectum and Anus
345
Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
345
01:20Ultrasound I: Abdominal Ultrasonography
332
Introduction:
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...
332