Acute pulmonary embolism.

Area of Science:

• Radiology and Medical Imaging
• Cardiovascular Imaging
• Diagnostic Imaging

Background:

• CT pulmonary angiography (CTPA) is the established first-line imaging modality for diagnosing pulmonary embolism (PE).
• Its high accuracy, ease of use, and widespread availability support its role, particularly in outpatient settings, as evidenced by PIOPED II findings.
• Ongoing technological advancements are crucial for refining PE detection through imaging.

Purpose of the Study:

• To review the current role and future directions of imaging in the diagnosis of pulmonary embolism.
• To address concerns regarding ionizing radiation associated with CTPA, especially in vulnerable populations.
• To explore the potential of alternative imaging modalities like SPECT V/Q and MRI in PE diagnosis.

Main Methods:

• Review of current literature and clinical guidelines regarding CT pulmonary angiography for PE evaluation.
• Discussion of technological advancements impacting CTPA performance and radiation dose reduction strategies.
• Exploration of the evolving roles of ventilation-perfusion (V/Q) SPECT and magnetic resonance (MR) imaging in PE diagnosis.

Main Results:

• CT pulmonary angiography is highly accurate and readily available, supporting its first-line status for PE.
• PIOPED II validates multidetector CT as a primary diagnostic tool, especially for outpatients.
• Radiation dose reduction methods are advocated, and alternative imaging modalities are under investigation.

Conclusions:

• CTPA remains the cornerstone for PE diagnosis, with continuous technological improvements enhancing its efficacy.
• Addressing radiation concerns is paramount, driving research into dose reduction and alternative imaging techniques.
• SPECT V/Q and MR imaging show promise for future PE diagnosis, potentially offering radiation-free or reduced-radiation options for select patients.