Transducer Facts
This point cannot be surpassed when creating a PZT element.
What is the curie point?
This component of the transducer prevents vibrations inside the case from sending out electrical voltages.
What is the electrical shield?
This is the depth at which the sound beam is wider than the active element.
What is: 2 near zone lengths.
These are four types of cysts located in the spleen.
This is the primary malignancy of the lymphatic system.
What is lymphoma?
This number refers to the amount of transducer components.
What is 7?
This is the plastic housing that contains the internal components of the transducer.
What is the case?
This determines lateral resolution.
What is the width of the sound beam?
This is the fractional bandwidth of a transducer.
What is 70?
This structure connects the active element and the ultrasound system.
What is the wire?
This type of relationship exists between frequency and focal depth.
What is a direct relationship?
This pathology refers to death of hepatocytes, excessive fibrous tissue, scalloping of liver margins and may be associated with Ascites.
What is cirrhosis?
This condition refers to thrombosis of the hepatic veins/inferior vena cava.
What is Budd-Chiari Syndrome?
What are Fraunhoffer zone and Far Field?
These factors determine amplitude.
What are sound source and the medium?
The "near zone length" can be referred to as these two regions.
What are:
The zone between the transducer face and focus
The zone between the focus and far field?
This shape is associated with Huygens' wavelets.
What is a V shape?
Ultrasound refers to pitches above this level of Kilohertz.
What is 20?
These two terms are synonymous with the term "Near zone".
What are Fresnel zone and Near Field?
This refers to the region of the testes in which the sperm mature fully.
What is the ductus epididymis?
This condition refers to a stone lodged in the cystic duct.
What is Mirizzi Syndrome?
These are the three "bigness" factors in Sonography.
What are amplitude, Power and Intensity?
This type of transducer is used in diagnostic ultrasound.
What is Bi-directional?
These are two reasons why we utilize synthetic PZT elements.
What are:
Cost, purity of the crystal (lacking inclusions - more resonant sound)?
The beam diameter is this much at the focus of a transducer.
What is 1/2?
These characteristics of the active element determine the frequency of sound created by a pulsed wave transducer.
What is the speed of sound in the PZT and the thickness of the PZT?
What is focal length?
These criteria predispose individuals to abdominal aortic aneurysm. (Pick at least 3)
What are: male, over 50 years of age, HTN, smoking, family hx of AAA, high cholesterol?
This type of tumor refers to a malignancy in the biliary system, located at the junction of the right and left hepatic ducts.
What is a Klatskin tumor?
Adjusting this during scans brings the image closer to us or further away from us.
What is depth?
This refers to the concentration of energy in a sound beam.
What is intensity?
This type of bandwidth is associated with a high Q Factor.
What is Narrow Bandwidth?
Ultrasound Transducers operate according to this principle?
Piezoelectric Effect
These three consequences are related to the backing material of the transducer.
What are decreased sensitivity, wide bandwidth and low Q Factor?
This is the amount of reflection that would occur if the matching layer did not exist.
What is 80%?
This is the location of the splenic vein to the pancreas.
What is posterior?
This refers to the sonographic appearance of Emphysematous Pyelonephritis.
What are echogenic regions accompanied by air and ring down artifacts?
Ultrasound transducers convert electrical energy to this.
What is acoustic energy?
This refers to the concentration of force in an area.
What is pressure?
This is the purpose of using gel as a coupling medium in diagnostic Sonography.