Steered continuous wave Doppler methods and systems for two-dimensional ultrasound transducer arrays

2010 ◽  
Vol 127 (6) ◽  
pp. 3872
Author(s):  
Paul Donald Freiburger
Keyword(s):  
Continuous Wave ◽  
Ultrasound Transducer ◽  
Two Dimensional ◽  
Continuous Wave Doppler ◽  
Transducer Arrays

Clinical application of a micro multiplane transoesophageal probe in congenital cardiac disease

2011 ◽  
Vol 22 (2) ◽  
pp. 170-177 ◽  
Author(s):  
Kuberan Pushparajah ◽  
Owen I. Miller ◽  
Debbie Rawlins ◽  
Anna Barlow ◽  
Kelly Nugent ◽  
...  
Keyword(s):  
Image Quality ◽  
Pulse Wave ◽  
Continuous Wave ◽  
Near Field ◽  
Diagnostic Value ◽  
Two Dimensional ◽  
Diagnostic Quality ◽  
Imaging Quality ◽  
Continuous Wave Doppler ◽  
Good Imaging

AbstractAimTo assess the quality of imaging modalities of a new micro multiplane transoesophageal echocardiogram probe.MethodThis is a prospective study of micro transoesophageal echocardiogram S8-3t probe used at a single institution between 15 December, 2009 and 15 March, 2010. The images were compared with standard paediatric or adult probes where possible. Assessors prospectively rated imaging quality – two dimensional, colour flow imaging, pulse wave, and continuous wave Doppler – with a subjective 4-point scale (1 = poor to 4 = excellent).ResultsA total of 24 studies were performed on 23 patients, with a median weight = 11.7 kilograms (2.6–72 kilograms) and a median age of 3 years (0.16–60 years). Of the 23 patients, one neonate (2.8 kilograms) had transient bradycardia on probe insertion. Imaging in patients less than 10 kilograms was of full diagnostic value and new information was obtained in eight out of ten patients. Pulse wave and continuous wave Doppler was consistently good across all weight groups. There were high frame rates and good imaging quality to a depth of 4–6 centimetres in all studies. A comparison with a larger alternative probe was available for 12 studies (weight 11.9–72 kilograms). The median micro transoesophageal two-dimensional image quality score was 3 (2–4) and 4 (3–4) with the comparative probe. For the 10- to 30-kilogram group, image quality with the micro transoesophageal echocardiogram probe was judged as inferior to larger standard probes. Adult sized patients had good imaging of near the field, allowing guidance for percutaneous device closure of the atrial septum.ConclusionThe micro multiplane transoesophageal echocardiogram probe provides imaging of diagnostic quality in neonates. In larger patients, it offers good imaging of near field structures. In the intermediate-sized child (10–30 kilograms), standard paediatric probes provide better imaging.

Doppler Debate Continued

PEDIATRICS ◽  
1983 ◽  
Vol 71 (3) ◽  
pp. 471-472
Author(s):  
RAUL BEJAR ◽  
T. ALLEN MERRITT ◽  
RONALD W. COEN ◽  
FRANK MANNINO ◽  
LOUIS GLUCK
Keyword(s):  
Blood Flow ◽  
Doppler Ultrasonography ◽  
Continuous Wave ◽  
Two Dimensional ◽  
Pulsed Doppler ◽  
Pulsatile Blood Flow ◽  
Indirect Measurements ◽  
Technical Problems ◽  
Continuous Wave Doppler ◽  
Dimensional Range

To the Editor.— We wish to answer the negative and often inappropriate responses generated by our commentary.1 As stated clearly, we do not oppose the transcutaneous Doppler technique; we intended only to discuss the technical problems inherent in continuous wave Doppler transducers and the interpretations made from indirect "measurements of cerebral blood flow" (CBF) and patterns of pulsatile blood flow. Most of the technical problems described in our commentary probably can be avoided by using two-dimensional, range-gated, pulsed Doppler ultrasonography.

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