Utilizing ultra-low-dose of 0.05 mSv for premature baby with congenital heart disease
Author: Authors: Jean-Francois Paul, MD* and Andreas Blaha** *Centre Chirurgical Marie Lannelongue / Le Plessis-Robinson, France **Business Unit CT, Siemens Healthcare, Forchheim, Germany
A premature baby was referred to the radiology department with diagnosis of congenital heart disease. An atrial and left ventricular septum defect could be detected with echocardiography but with a doubt about the exact origin and course of right pulmonary artery. Therefore a low-dose CT examination was requested, utilizing low kilovoltage (kV) and low milliampere seconds (mAs) to achieve ultra-low-dose radiation values. The CTA was acquired with a fast pitch spiral technique (Flash Spiral Cardio) while a mean heart rate of 56 bpm was present.
Diagnosis A mild stenosis present at the ostium of the right pulmonary artery (RPA) could be observed. Although the RPA showed an irregularity it had a normal anatomical course. The ventricular septum defect as well as the still open atrial septum could be clearly revealed by using oblique planar reformations. The right coronary artery was well depicted despite a heart rate of 157 bpm.
Comments The data acquisition was performed with a SOMATOM Definition Flash using the ECG triggered sequential mode (Flash Cardio Sequence) which resulted in an ultra-low-dose value of 0.05 mSv. Calculated with the dose length product (DLP) of 1, an estimated dose of 0.05 mSv (50 micro Sv) could be achieved. Using the Definition Flash low-dose acquisition technique it was possible to detect this congenital heart disease (CHD) in a very early stage of the patients life.
SOMATOM Definition Flash
Flash Cardio Sequence
Cranio - Caudal
80 kV / 80 kV
128 x 0.6 mm
CT Cardiac Engine
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