A lucency just means a dark area on the x-ray/CT as opposed to an opacity (which is a white area). I'm not sure what type of CT scan you got (i.e. with or without contrast injection), but don't jump to conclusions about it being cancer..... lucency just means a dark area on the x-ray/CT as opposed to an opacity (which is a white area). I'm not sure what type of CT scan you got (i.e. with or without contrast injection), but don't jump to conclusions about it being cancer.....
The operational details of amplifiers are buried in the field of electronics, but for audio purposes it is usually safe to say that current commercial audio amplifiers are so good that a normally operating amplifier is seldom the limitation on the fidelity of a sound reproduction system.
Imaging is made possible by the transmission and return of sound waves of a frequency much too high for the human ear to hear; Audible sound is in the range of 20- greater than 20,000Hz; Allows for the transmission of ultrasound waves into the body. These waves travel a distance where they reach organs/structures within the desired range of imaging. They bounce off the structure, and return to the ultrasound transducer where they are received and turned into an image by the ultrasound system.