Sentence examples for modulation the tube from inspiring English sources
With angular tube current modulation, the tube current varies during the course of a rotation.
In angular modulation, the tube current is adjusted to adapt differences in attenuation between anteroposterior and lateral positions.
With longitudinal tube current modulation, the tube current varies along the z-axis based on the size, shape, and attenuation to maintain a predefined noise ratio.
Unlike angular modulation, the z-axis modulation adjusts the tube current to accommodate differences in attenuation along the z-axis of the patient (e.g., shoulder and abdomen).
Automatic exposure modulation controlling the tube current with an mA range of 200 500 and kilovoltage setting of 100 kVp is recommended for adequate assessment of the thoracic aorta [9].
Planning and surveillance CT examinations were performed using one of two CT systems (Siemens Sensation 16 and Siemens Sensation 64, Siemens Medical, Bracknell, UK), using the same standardised aorta protocol, with 5-mm unenhanced slices and 1-mm slices following intravenous contrast medium (all at 120 kV with modulation of the tube current with respect to patient size: approx 120 160 mA).
The modulation of the tube current can be used to lower the radiation exposure of the patient.
Modulation of the tube current is encouraged in the absence of metallic implants (e.g. orthopaedic braces) in the coaxial imaging range to lower patient exposure.
Nevertheless, several strategies to reduce radiation exposure have been developed, including tube modulation, the use of lower tube voltages and of prospective electrocardiographic (ECG) triggering, allowing the reduction of effective radiation dose to the range of 1.3-4.2 1.3-4.2, 32, 33, 34].
Long pulse results (15.5 s at 400 kW) as well as considerations on power modulation capabilities of the tube and on long pulse effects are discussed.
A number of dose reduction strategies are available, such as tube current modulation and alteration of the tube current and voltage dependant on the patient's body mass index [40] and more recently iterative reconstruction techniques [41].
