No continuing education / Category A credit assigned to this presentation.
Superimposition of anatomical structures and of diseases processes limits the diagnostic utility of chest x-ray (CXR) in detection of isolated pathologies (e.g., lung nodules) and in characterization of disease (e.g., lung atelectasis, consolidation, pleural effusions).
Digital Tomosynthesis (DT) overcomes these limitations by using spatial discrimination to separate overlapping structures. However, DT is limited by the maximum arc for image acquisition (-15° to +15°) and by motion artifacts from the prolonged acquisition time (10s).
The study aim was to evaluate these limitations and to determine their impact on diagnostic quality for a cohort of patients with thoracic disease. Seventeen patients; mean age 61(range 43-77), consented to receive matched pairs of thoracic DT and CXR. Image quality (IQ) was assessed on a 5 point RadLex scale by 7 radiologists. The radiation dose for DT was higher than CXR (34.56± 11.75 mAs versus 12.13 ±6.82 mAs). 47% of patients had artifacts from patient motion or implanted devices on DT; however the IQ rating for DT was significantly higher than for CXR (3.63±0.25 versus 3.48 ±0.25). In conclusion, thoracic DT is a promising technique in the clinical setting as it overcomes the limitations of CXR.
- Acquire knowledge of digital tomography (DT) imaging including movement, dose, positioning and limitation
- Assess the clinical features demonstrated on a chest DT image using illustrative examples
- Explore the advantages of chest DT imaging compared to the current standard chest x-ray