Dual Source CT - Gout imaging with Spiral Dual Energy Scanning

SOMATOM Definition Dual Energy Scanning

Thorsten Johnson, MD, Sabine Weckbach, MD and Christoph R Becker, MD
Section Chief Body CT, Department of Clinical Radiology, University Medical Center Grosshadern / Munich, Germany

 |  2007-06-26


A 37 year-old male was referred for a Dual Source CT for the evaluation of joint deformity. A contrast enhanced MDCT scan of the hand was performed on the SOMATOM Definition using spiral dual energy evaluation.


After the dual energy scan, a joint deformity was visible on the patient’s right index finger due to gout, which turned out to be the main cause for limitation of motion. These uric acid deposits develop mainly in cartilage tissue, tendons, and soft tissues. They usually develop only after a patient has suffered from the disease for many years.


In the dual energy mode, two x-ray sources can be operated simultaneously at different kV levels. The results are two spiral data sets acquired in a single scan providing diverse information that allows one to differentiate, characterize, isolate, and distinguish the imaged tissue and material.

Examination Protocol

Scanner SOMATOM Definition
Scan area Hand scan
Scan length 255mm
Scan time 19s
Scan direction Cranio-caudal
kV 140 kV and 80 kV
Effective mAs 70 effmAs / 200 effmAs
Rotation time 1.0 s
Slice collimation 0.6 mm
Reconstructed slice thickness 1.0 mm
Spatial Resolution 0.33 mm
Increment 0.5 mm
CTDIvol 7.2 mGy
Kernel D30s
Dose Modulation CARE Dose4D™
Contrast Amount 50 ml
Contrast Flow rate 3 ml/sec
Delay time 7 sec

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The drugs and doses mentioned herein are consistent with the approval labelling for uses and/or indications of the drug. The treating physician bears the sole responsibility for the diagnosis and treatment of patients, including drugs and doses prescribed in connection with such use. The Operating Instructions must always be strictly followed when operating the system. The source for the technical data is the corresponding data sheets. Results may vary.