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Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...

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Related Experiment Video

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High Resolution 3D Imaging of Ex-Vivo Biological Samples by Micro CT
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Low-dose ultrahigh-resolution PCCT enhances subsolid nodule characterization.

Qinqin Yan1, Fuhua Yan1, Qi Lin1

  • 1Department of Radiology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197, Ruijin Second Road, Huangpu District, Shanghai, China.

La Radiologia Medica
|July 29, 2025
PubMed
Summary
This summary is machine-generated.

Ultrahigh-resolution photon-counting CT (PCCT) better detects invasion in lung nodules than standard CT. This advanced imaging offers superior detail at half the radiation dose of older methods.

Keywords:
Lung adenocarcinomaPhoton-counting CTSubsolid nodulesUltrahigh resolution

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Area of Science:

  • Radiology
  • Medical Imaging
  • Pulmonology

Background:

  • Subsolid pulmonary nodules require accurate characterization to differentiate benign from malignant lesions.
  • Early detection of invasive lung adenocarcinoma (LUAD) is crucial for patient outcomes.
  • Standard high-resolution CT (HR CT) may have limitations in visualizing subtle invasion-associated features.

Purpose of the Study:

  • To characterize invasion-associated CT features in pulmonary subsolid nodules using low-dose ultrahigh-resolution (UHR) photon-counting CT (PCCT) images.
  • To evaluate the diagnostic superiority of UHR images over standard HR images for detecting invasion.
  • To compare image quality and radiation dose between PCCT and energy-integrating detector CT (EID-CT).

Main Methods:

  • Chest scans were performed on PCCT in patients with subsolid lung adenocarcinoma, acquiring both UHR and standard HR images.
  • Nodule characteristics were assessed visually, and histogram features were extracted.
  • Image quality and radiation dose were compared between PCCT and EID-CT in a subset of patients.

Main Results:

  • UHR significantly outperformed standard HR in detecting invasion-associated features like larger nodular/solid diameters, heterogeneous attenuation, lobulation, and air bronchograms (P < 0.05).
  • UHR images showed significantly greater value in histogram-derived parameters compared to standard HR images (P < 0.05).
  • PCCT achieved half the radiation dose of EID-CT (effective dose: 1.32 vs. 3.85 mSv) with significantly better image quality.

Conclusions:

  • UHR imaging on PCCT enhances visualization of invasion-associated CT characteristics in subsolid LUAD, surpassing standard HR imaging.
  • This advanced protocol offers improved diagnostic capability for detecting invasive growth.
  • PCCT provides these benefits at a reduced radiation dose and superior image quality compared to EID-CT.