Radio frequency - Study guides, Class notes & Summaries

Purpose of RF (B1) field - excite hydrogen protons RF energy is absorbed by tissues - within the volume of the RF transmit coil. This is a thermogenic process. Thermogenic process - Results in production of heat. Ex: RF energy absorption MRI local and whole-body tissue heating is due to - magnetic induction Types of RF coil designs --linearly polarized -circularly polarized (quadrature) Function of coils - -transmit only -receive only -transmit/receive Most common type of coil used - r...

Different tissues that have signals that appear similar on an MR image are described as: A) hypointense B) hyperintense C) isointense D) isodense - Answer isointense in a large main magnetic field such as those employed in MRI, the motion of a hydrogen proton has been described as wobbling like a spinning top. this motion is called A) precession B) resonance C) frequency D) angular momentum - Answer precession magnetic resonance imaging is derived from the process known as: A) ma...

Associate CET practice Exam Questions and Answers (2024) 100%Correct Solution. 8.33 meters is the full wavelength in air for what RF frequency? Answer- 36 MHz Decimal 164 would appear as ________ in binary? Answer- A resistor has color stripes yellow, violet, violet, silver. It is: Answer- 470 MegOhm +/- 10% what is the total capacitance of three capacitors valued at 100pf, 100pf, and 50pf when connected in a series? Answer- 25 pf what is the ripple frequency of a full wave single phase ...

Electrolysis Final Exam Questions & Answers In 1875, it was first reported that Dr. Charles E. Michel, a St. Louis ophthalmologist, was using galvanic electrolysis to treat what? - ️️ Patients with ingrown eyelashes. In 1916, Multiple Needle (16) galvanic electrolysis machine was created by who? Used in DC only. - ️️ Paul Kree In 1924 Dr. Henri Bordier unveiled what? - ️️ His Radio Frequency epilator, creating what we call Thermolysis. Mildred Trotter published a study proving...

LASER HAIR REMOVAL EXAM QUESTIONS AND ANSWERS LASER - Answer ️️ -Light amplification by the stimulated emission of radiation Light consist of many wave lengths - Answer ️️ -Laser consist of just one The FDA approved lasers for permanent hair reduction - Answer ️️ -In. 1997 When was the Ruby crystal laser invented - Answer ️️ -In 1960 The Ruby crystal uses what wavelength - Answer ️️ -694 nm In 1960 the ruby crystal was invented and used for - Answer ️️ -Dermatology...

Progression: Field Tech II - III Conventional Exam 2024 What is one reason why broadband cable operators install fiber-optic cable in stages instead of changing the infrastructure all at once? - Answer ️️ -Changing the infrastructure all at once would cause too many service disruptions. What is the difference between the fiber-to-the-node (FTTN) and fiber-to-the-curb (FTTC) topologies? - Answer ️️ -An FTTC is allowed a smaller number of RF amplifiers between the optical fiber and t...

When determining RF energy, strength of magnetic field is measured in - Answer mT Main biological effect of exposing tissue to electromagnetic radiation in that frequency range - Answer tissue heating Cause of tissue heating - Answer Magnetic induction results in eddy currents of conductive tissue

MRSO - RADIO FREQUENCY - MODULE 4 Test Review |Question and Answers| 100% Correct Purpose of RF (B1) field *Ans* excite hydrogen protons RF energy is absorbed by tissues *Ans* within the volume of the RF transmit coil. This is a thermogenic process. Thermogenic process *Ans* Results in production of heat. Ex: RF energy absorption MRI local and whole-body tissue heating is due to *Ans* magnetic induction Types of RF coil designs *Ans* -linearly polarized -circularly polarized (quadratu...

CETA Exam Questions And Answers VGA - ANSWER- 640 x 480 256 Colors 15 Pins SVGA - ANSWER- 800 x 600 256 Colors 15 Pins XGA - ANSWER- 1024 x 768 or 1366 x 768 16 mil, HD Colors 15 Pins Widescreen - ANSWER- 1280 x 720 or 1920 x 1080 DVI or HDMI Connectors Random Access Memory - ANSWER- RAM Read Only Memory - ANSWER- ROM Programmable Read Only Memory - ANSWER- PROM Electrical Programmable Read Only Memory - ANSWER- EPROM Electrically Erasable PROM - ANSWER- EEPROM 50 Ohms - ANSWE...

NCTI FINAL EXAM: PROGRESSION FIELD TECH 2- 3 TEST EXAM| NEWLY UPDATE 2023/ 2024 What does the "on with threshold" setting of the Request to send/clear to send (RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to control? Answer: To control which frames over a certain size are announced and cleared to send by the stations. What is the purpose of the distributed coordination function (DCF) in an Institute of Electrical and Ele...