- Видео 27
- Просмотров 141 380
Bob Grossman
Добавлен 10 июн 2007
Short videos on subjects which may appear on your Radiography registry.
XRayBob
This video demonstrates how to compare receptor exposures for conditions that have different kVp, Grids, and distances.
Просмотров: 85
Видео
XRayBob converts from milli to micro and moves to Scientific Notation
Просмотров 3763 года назад
In this video I will conver 0.2 mGy to uGy and express the answer in scientific notation. No rubber chickens were harmed in the making of this video.
XRayBob converts 1nCi to Bequerels
Просмотров 1,4 тыс.4 года назад
In this video I convert 1nCi to Bequerels.
XRayBob Converts 9800 nSv to uSv
Просмотров 2164 года назад
In this video I use my math to convert 9800 nSv to uSv.
XRayBob converts 4500nrads to mGy
Просмотров 1564 года назад
In this video I use my math skills to convert 4500 nrads to mGy
XRayBob The Digital Image
Просмотров 4,7 тыс.6 лет назад
This video presents characteristics of the digital image, the digital display, defining a matrix, pixel, spatial resolution, contrast resolution, and bit depth.
XRayBob Rank and Sum Shortcut Example 2 (Complex Exposure Settings)
Просмотров 3197 лет назад
In this video we calculate which exposure results in the least exposure on the IR with changes in speed, distance, kVp, Grids, and mAs. Rank and Sum Shortcut demonstrated as well as how to get the precise answer.
XRayBob Rank and Sum Shortcut Example 1 (Complex Exposure Settings)
Просмотров 2667 лет назад
Math example on how to find the conditions that result in the highest exposure to the IR. Factors included are Grids, mAs and kVp. Example shows the rank and sum shortcut method which gives you an approximate ranking of the conditions and how to calculate the answer exactly.
XRayBob X-Ray Interactions with Matter
Просмотров 29 тыс.7 лет назад
A review of the 5 interactions X-rays can have with matter. 5 Interactions: Coherent, Compton, Photoelectric, Pair Production and Photodisintegration.
XRayBob Half Value Layer Math Examples
Просмотров 21 тыс.7 лет назад
Here is a brief explanation of Half Value Layers along with some math problem examples.
XRayBob Exposure Indicators
Просмотров 3,5 тыс.8 лет назад
Learn about Exposure Indicators ! Enjoy some exciting Math Examples using Siemens EXI number, Fuji's Crazy S#, Agfa Log Median, and the Carestream/Kodak EI. For math examples email XRayBob for a worksheet. If you enjoyed this video check out the Deviation Index Video ! No rubber chickens were harmed in the making of this video.
XRayBob Deviation Index
Просмотров 3,4 тыс.8 лет назад
Video on Deviation Index with some math examples. Be sure to watch the video on exposure indexes before this video. Thanks to Dennis Bowman for some key content and the great conversion table presented at the end.
XRayBob Power and Heat Units
Просмотров 3,8 тыс.8 лет назад
Math problems calculating Power and Heat Units
XRayBob Cooling Curves
Просмотров 12 тыс.8 лет назад
Help on doing problems that involve anode and housing cooling curves.
XRayBob Spatial Frequency Math
Просмотров 2,1 тыс.9 лет назад
Some Math examples for Spatial Frequency, Field Of View, Matrix Size and Pixel Size Problems
XRayBob C-Arm Overview and Scatter Radiation
Просмотров 11 тыс.9 лет назад
XRayBob C-Arm Overview and Scatter Radiation
XRayBob Bridge Circuit Rectifier Problems
Просмотров 4 тыс.9 лет назад
XRayBob Bridge Circuit Rectifier Problems
XRayBob Planck's Quantum Equation Math Examples
Просмотров 8879 лет назад
XRayBob Planck's Quantum Equation Math Examples
XRayBob Inverse Square Law Math Examples
Просмотров 16 тыс.9 лет назад
XRayBob Inverse Square Law Math Examples
XRayBob Radioactive Decay Math Examples
Просмотров 1,2 тыс.9 лет назад
XRayBob Radioactive Decay Math Examples
XRayBob Minification, Flux, & Brightness Gain Math Examples
Просмотров 12 тыс.10 лет назад
XRayBob Minification, Flux, & Brightness Gain Math Examples
Nice video! Can you tell me how to calculate spatial resolution with given matrix size and FOV ?
I love you Bob… I swear I do.
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You're a life saver Thanks mate
that is a great lecture, thanks for sharing it with us
how do we identify if the amount of heat unit is safe?
magnificent video
that was gross, man haha but in all honesty this was really helpful thank you much appreciated. hope i remember this by the time registry exam comes.
Great presentayion
Thank you xray bob!
Have you seen my pit-bully? Charley makes a cameo in one of my XRayBob Videos. Glad you enjoyed the video and found it helpful. I love your RUclips user name since I call my dog Scrappy Doo all the time.
Thank you 🙏
nice
Thanx a million
thank you , very helpful .
THANKS
What is the purpose of being able to figure these?
Thank you for the video Sir. I have a question in my mind. Could you share how we can calculate maximum heat units anode can store ?
the maximum heat units the anode can safely absorb is 350,000. This is the Y of the curve when time =0. The Y axis intercept of the cooling curve is 350,000. Bob
350,000 is for the first curve shown in the video.
@@bobgrossman1 How can we theoretically estimate heat energy anode can safely absorb for any X-ray tube? Is there any specific equation or limiting factor we can rely on? Thank you!
this was incredibly helpful, my classmate and i are so much more understanding of this chapter since watching your video. thank you so much
It was an excellent presentation. I have a doubt on the occurrence of multiple scattering takes place at the Compton scattering. How does the multiple scattering on Compton finally leads to photoelectric effect ? Coz as the multiple scattering takes place the wavelength of the X-rays will be keep on reducing r8, then how comes the photoelectric absorption can occur with the energy less then that of required for compton scattering.? Kindly clarify me ! Thanks in advance.
These interactions are occurring in the body which means the atom that will photoelectrically absorb the x-ray photon might be atoms of Calcium or Oxygen or Carbon. These atoms have rather low K Shell binding energy levels. So a 60 kEv x-ray photon might exit the tube and enter the patient and have several Compton Scattering interactions, each reducing the energy of the x-ray photon and then eventually get photoelectrically absorbed by a Calcium atom. Hope that clarifies.
Where did you find your information about doubling the mass and the effective change on the index?
www.aapm.org/pubs/reports/RPT_116.pdf AAPM Report 116
What happens after with an electric photon ?? Is it possible to produce bremsstrahlung inside the human body through this interaction ??
What happens after with an electric photon ?? Is it possible to produce bremsstrahlung inside the human body through this interaction ??
Character In the video It's great, I like it a lot $$
Great video!
The best explanation!!! Thank you very much!!!
awesome video truly a lifesaver and Mr. Grossman you have an awesome personality in your videos (:
good for ndt as well
Thank you 🙏🏽
You didn't give reply sir
Thnx ❤️
thats my dad at the beggining! go dad!!!
Hello!! This is such a weird question but I’m currently an X-ray student and my clinical instructor absolutely loves you and always recommends all of us your videos!! I was wondering if there was a possibility for a graduation gift, if I could literally have you sign a tshirt or something so I can give it to my clinical instructor. If you’re interested please comment back with your email!
Alyissa, I would be delighted to sign a T-shirt or help you with this gift. Feel free to contact me directly at bobgrossman1@gmail.com. Hope the videos have been useful.
I will find who ever disliked this video and destroy them
way to go bob :D
Problem type 2 was a ruse indeed. Thumbs up!
Very well explained. Thank you for this, Jim
Great explanation , thank you. Keep your mR/min exposure down low , like really low. Jim
This is come in the best time
This ndt test i gotta pass is ANNOYING
Very bad presentation
I agree
Hello Sir Bob it is a very useful educational video, please can you send us your comments as a written documents because I wanted to educate our radiation workers staff in my hospital. Thank you.
Bob, awesome video! Very informative with your clear demonstration using a live C-Arm and tissue phantom. Your description as to where scatter goes depending on orientation/angulation of the C-Arm was very informative. Question, the head/foot of the table, would you have any information regarding scattered radiation in those directions?
it depends where you point. If you put on a cranial angle (point tube towards the head) then more radiation scatters towards the foot then the head. If you are on the patients right side and you need to rotate to an RAO or LOA you should rotate the big C so the tube goes away from you, that is the lower dose position. Hope that makes sense and helps.
@@bobgrossman1 thank you for the speedy reply! Taking angulation of the beam into consideration I can definitely positions myself and guide other staffers! Some specifics, straight AP shot into the patient’s lumbar region, zero tilt and zero rotation on the beam. How safe from scatter/exposure is someone standing at the head or foot of the OR table?
@@op3rator531 email me directly at bobgrossman1@gmail.com so I can send you some isoexposure curves that you may find useful.
👍👍👍
Hi Xray Bob is there anyway I can get ur powerpoints for personal study? Thanks
So helpful!
Best clip on image formation on RUclips. Thanks!
Thank you so much for making this video. You are awesome!
Hi Bob, I am taking radiography in the digital age class, and using the book of Quinn.B.Carroll 3rd edition. Do you have all of the explanations for each chapter for this book
Turns out you can use New mAs = (mAs)(0.8)^DI for all values of DI! Just one exposure indicator and just one formula.
Ooops another error was pointed out. For problem 3 at time 7 minutes the slide erroneously says the technique was overexposed. Sorry