Computed Tomography Dose Reduction Using Sequential or Fast Pitch Sprial Technique

The development of a novel CT scanner capable of sequential or fast-pitch spiral techniques
in most patients (Siemens Definition Flash) represents a potentially crucial technical
innovation at a particularly critical juncture. National healthcare systems are under
pressure to deliver accurate and cost-effective diagnosis of an increasing number of
patients and CT angiography in various settings is a proven, highly accurate technique that
has been shown to improve diagnostic efficiency and reduce the cost of care.

However, there has been increasing concern about the lifetime attributable risk of cancer
from radiation related to diagnostic procedures. Such concern extends to other
radiation-based procedures that contribute to the cumulative lifetime radiation exposure of
patients. The Flash scanner holds the promise of substantially reducing exposure resulting
from a variety of examinations.

The CT DOSE multicenter trial is therefore designed to validate the extent of dose reduction
attendant to the use of the Flash scanner in cardiothoracic scanning, and to determine
whether image quality is preserved in spite of significant dose reduction.

Inclusion Criteria:

- Scans from patients undergoing clinically indicated pulmonary angiography,
aortography and/or CCTA.

- Age greater than or equal to 18 years.

Exclusion Criteria:

- No exclusions