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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

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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.
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Lung densitometry: why, how and when.

Mario Mascalchi1, Gianna Camiciottoli1,2, Stefano Diciotti3

  • 1"Mario Serio" Department of Experimental and Clinical Biomedical Sciences.

Journal of Thoracic Disease
|December 10, 2017
PubMed
Summary
This summary is machine-generated.

Lung densitometry using computed tomography (CT) offers a reproducible and comprehensive method for assessing diffuse lung diseases like emphysema and fibrosis, outperforming visual scales. This advanced technique improves correlation with pathology and pulmonary function tests (PFT).

Keywords:
Chronic obstructive pulmonary diseases (COPD)computed tomography (CT)emphysemalung densitometrypulmonary fibrosis

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Medical Imaging Analysis

Background:

  • Diffuse lung diseases, including emphysema and fibrosis, are often assessed using semi-quantitative visual scales on computed tomography (CT).
  • These visual scales have limitations in reproducibility and completeness of lung tissue assessment.
  • Lung densitometry offers a quantitative alternative to visual assessment of lung abnormalities.

Purpose of the Study:

  • To highlight the advantages of lung densitometry over traditional visual scales for assessing diffuse lung diseases.
  • To detail the methodologies and emerging applications of lung densitometry in pulmonary medicine.
  • To establish lung densitometry as a recommended endpoint in clinical trials for lung fibrosis and emphysema.

Main Methods:

  • Lung densitometry quantifies X-ray attenuation in pulmonary tissue using CT scans.
  • Key measurements include mean density, standard deviation, relative area (RA) at specific Hounsfield units (HU), and percentiles for emphysema.
  • Kurtosis and skewness are utilized for evaluating pulmonary fibrosis, while RA at -856 HU is used for air trapping assessment.

Main Results:

  • Lung densitometry demonstrates improved reproducibility, complete lung assessment, and shorter computation times compared to visual scales.
  • It shows better correlation with pathology quantification for emphysema and comparable or superior correlation with pulmonary function tests (PFT).
  • Emerging applications include air trapping evaluation, staging of lymphangioleiomyomatosis (LAM), and monitoring disease progression.

Conclusions:

  • Lung densitometry is a superior method for assessing diffuse lung diseases, offering enhanced accuracy and efficiency.
  • It is indicated for emphysema assessment in chronic obstructive pulmonary diseases (COPD) and shows promise in various other pulmonary conditions.
  • Lung densitometry is recommended as a key endpoint in pharmacological trials for emphysema and lung fibrosis.