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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET

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Related Experiment Video

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Three-Dimensional Reconstruction for the Whole Lung with Early Multiple Pulmonary Nodules
07:53

Three-Dimensional Reconstruction for the Whole Lung with Early Multiple Pulmonary Nodules

Published on: October 13, 2023

Computed tomography perfusion using first pass methods for lung nodule characterization.

Igor Sitartchouk1, Heidi C Roberts, Andre M Pereira

  • 1Department of Medical Imaging, University Health Network, Toronto, Ontario, Canada.

Investigative Radiology
|May 23, 2008
PubMed
Summary
This summary is machine-generated.

Computed tomography (CT) perfusion with first-pass modeling shows promise for characterizing lung nodules. Key parameters like blood flow (BF) and blood volume (BV) effectively differentiate malignant from benign nodules.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Oncology

Background:

  • Lung nodules require accurate characterization to determine malignancy.
  • Computed tomography (CT) perfusion offers potential for non-invasive tissue assessment.

Purpose of the Study:

  • To evaluate the feasibility of first-pass computed tomography (CT) perfusion methods for characterizing lung nodules.
  • To assess the utility of microvascular parameters in differentiating malignant from benign lung nodules.

Main Methods:

  • Fifty-seven patients with 51 malignant and 6 benign nodules underwent dynamic contrast-enhanced CT.
  • Kinetic analysis was performed using CT Perfusion 3 (distributed parameter model) and an in-house Patlak-style analysis.
  • Parameters assessed included blood volume (BV), blood flow (BF), mean transit time, and permeability surface area (Kps).

Main Results:

  • Significant differences were observed in blood flow (BF) between malignant (111.3 mL/min/100 g) and benign (39.1 mL/min/100 g) nodules (P < 0.001).
  • Blood volume (BV) was also significantly higher in malignant (9.3 mL/100 g) versus benign (4.1 mL/100 g) nodules (P < 0.002).
  • Patlak analysis showed higher Kps (13.3 mL/100 g/min) in malignant nodules compared to benign (3.9 mL/100 g/min) (P < 0.001).

Conclusions:

  • First-pass CT perfusion modeling is a feasible technique for lung nodule characterization.
  • Microvascular parameters, including BF, BV, and Kps, are valuable for distinguishing malignant from benign lung nodules.
  • Despite limitations, CT perfusion provides useful insights into nodule microvasculature.