8.2 - Photon Percentage Depth Dose (PDD) curves

[@user-do5xp2xn9l]

Your videos are great! Not sure if you're still reading comments, but shouldn't it be >100cm SSD at 12:25 ?

[@trollinginmymind39]

Yeah same doubt

[@good4eveeeer]

Your videos are great, very helpful indeed.

[@adamwilliams932]

Wow - this series is absolutely fantastic. So clearly explained. Thank you!

[@GammaRay25]

great explanations!

[@prashantpmonline]

Very informative videos ....

[@VikDUH]

Thank you, I found this helpful !

[@sarahjarrett8347]

This is wonderful... However, you are speaking very fast. It would be more helpful if you could speak just a little slower

[@nouram7371]

Big thank you !! This is so helpful

[@mel-yh5py]

is buildup the same as skin sparing effect

[@86412khaled]

slowly pleaseeeeeee, thank you any way

[@kca698]

at 10:42, I don't understand how you can say that scattered photons have a much longer range... Can someone explain?

[@max36988963]

much longer range compared to the electrons produced by photon interactions at that point. Electrons being charged, deposit their energy in much shorter distances than photons.

[@martianboy9886]

+ROscribbles I'm curious :) When the point of calculation is placed in the built up region, will the plan be hotter than if the calculation point is placed at a depth beyond Dmax?

[@roscribbles4155]

Hiya! Sorry, I'm a little bit rusty and devoid of textbooks at the moment, so I'd probably give you a worse answer than one of the planning staff in your/your nearby radiotherapy centre, if they're available to ask.

[@tylerb8746]

For single beam plans (mostly electrons), the point of normalization is typically chosen beyond dmax (d90, d80), though effectively it would be the same to normalize to the d90 point prior to dmax as to normalize to d90 post-dmax

[@yapyoonfoo]

Thank you my lord

[@NihayetFarooq]

sir,please explain it a bit slowly ...u are too fast and it becomes difficult for the Asian people to understand it properly , or else u can help us with subtitles ...

[@sinamardfar1652]

Speaking too fast