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DWI vs ADC MRI sequences: EXPLAINED 

Radiology Tutorials
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High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇
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=========================
Understanding how to tell the difference between diffusion weighted imaging (DWI) and apparent diffusion coefficient (ADC) MRI images can be easy!
I use my trusty chopstick (!) to demonstrate the physics of MRI sequences. By the end, you'll confidently differentiate DWI vs ADC images (and know why this is important).
Chapters:
0:00 Intro
0:27 Why do people get confused?
1:58 Basic physics explanation
9:06 How is a DWI image created?
10:17 What contributes to signal?
12:26 How to eliminate T2 shine through
14:17 Clinical example
17:32 Outro
Case courtesy of Dr Ian Bickle, Radiopaedia.org, rID: 26111
=========================
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Not sure if the question banks are for you?
If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves!
The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not.
Happy studying,
Michael
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29 июн 2024

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Комментарии : 109   
@chunk032
@chunk032 Год назад
How many times have I come back to this video!! Thank you so much
@radiologytutorials
@radiologytutorials Год назад
Haha, even me 😂
@user-tl3lo3wp5g
@user-tl3lo3wp5g 11 месяцев назад
Please do a comprehensive video on mri physics. You just demystified the physics behind DWI and its very well understood. thank you Doc
@MeanMugger
@MeanMugger 10 месяцев назад
This was SO helpful as I'm studying for boards. Thanks for such a clear simplified explanation!
@radiologytutorials
@radiologytutorials 10 месяцев назад
Glad it was helpful!
@medhavyas2408
@medhavyas2408 Год назад
Really simplified it. Thank you so much! Keep making such videos!
@radiologytutorials
@radiologytutorials Год назад
It's a pleasure. Any topics in particular you want me to cover?
@CatMedy
@CatMedy Год назад
it is incredible how you managed to explain such difficult theme! Thank you so much!
@radiologytutorials
@radiologytutorials Год назад
Thank you! I'm glad it helped 😊
@user-mr5ox5ul7v
@user-mr5ox5ul7v 5 месяцев назад
Amazing video, so well and easy explained. Thank you
@hameedaklan
@hameedaklan Год назад
I am really amazed by the way you simplify difficult topics.Thanks so much.
@radiologytutorials
@radiologytutorials Год назад
That's great to hear! I never know if I'm actually making sense or not 😅 so it's very helpful to get comments like this. Thank you Hameed
@gihans.96
@gihans.96 5 месяцев назад
Thank you so much for your simple yet beneficial explanation
@jim8439
@jim8439 7 месяцев назад
Excellent video, very clear. Thank you for sharing
@Sam-yv9zj
@Sam-yv9zj Год назад
Amazing video, can't wait to see the rest. Thanks a lot (From a french intern)
@jademiller3728
@jademiller3728 Год назад
Thank you for the video, I understand this process far more now.
@radiologytutorials
@radiologytutorials Год назад
Great! I'm glad it helped Jade 😊
@cocoillo
@cocoillo Год назад
I'm an undergrad just getting started in radiology with my first position as a clinical research assistant. This was ridiculously helpful, you're amazing! Thank you!
@radiologytutorials
@radiologytutorials Год назад
Ah, I’m so glad it helped! Good luck with the clinical research post 🙂
@user-ir7yd4xl9d
@user-ir7yd4xl9d 10 месяцев назад
You are truly phenomenal. Thank you for sharing!
@radiologytutorials
@radiologytutorials 9 месяцев назад
Thank you!
@fridayani4983
@fridayani4983 7 месяцев назад
Thank you for sharing these explainations
@pamelapena1040
@pamelapena1040 Год назад
Excellent! So practical and applicable minus the complex physics ! Thank you
@radiologytutorials
@radiologytutorials Год назад
There's no getting away from the physics 😖 Thanks for watching!
@andreschica5102
@andreschica5102 Год назад
Great content! Truly helpful!
@radiologytutorials
@radiologytutorials Год назад
Thank you Andrés! Glad it helped 🙂
@parastoomohebkhodaei3918
@parastoomohebkhodaei3918 Год назад
the best explanation out there. thanks a lot
@radiologytutorials
@radiologytutorials Год назад
Thank you Parastoo. That's very kind of you to say 😊
@smarinz7
@smarinz7 Год назад
Thank you so much!Your videos really helps me for my exam preparation. Hello 👋🏼from Malaysia!😊
@radiologytutorials
@radiologytutorials Год назад
Hello from 🇿🇦 to 🇲🇾! I'm glad the videos are helping 😊
@mattd3477
@mattd3477 Год назад
Love this channel!
@radiologytutorials
@radiologytutorials Год назад
Thank you Matt. That really means a lot 😊
@rodrigocosta7374
@rodrigocosta7374 Год назад
This was amazing. Thank you!
@radiologytutorials
@radiologytutorials Год назад
Pleasure Rodrigo 👍🏼 glad it was helpful!
@user-ww3cp3vw6f
@user-ww3cp3vw6f Год назад
Thank you so much. Excellent tutorial...
@radiologytutorials
@radiologytutorials Год назад
Thank you 🙏🏻
@kocho-nt9gc
@kocho-nt9gc 9 месяцев назад
Thanks for sharing this I wonder how you explain all complicated stuff in such a simple way
@radiologytutorials
@radiologytutorials 8 месяцев назад
So glad you enjoyed it 😀. Takes quite a lot of preparation 😆
@honeybee095
@honeybee095 Год назад
Extremely helpful! I am probably gonna speak the same words for my viva!
@radiologytutorials
@radiologytutorials Год назад
I always find myself coming back to this to remind myself 😅 glad it’s helpful Pallavi!
@mahdou5097
@mahdou5097 11 месяцев назад
Really awesome explained ! Thank u
@radiologytutorials
@radiologytutorials 11 месяцев назад
So glad to hear it. Thank you!
@RaviRanjan-rt9fk
@RaviRanjan-rt9fk Год назад
I have read theoretical part of dwi and adc but was not correlating.now everything is crystal clear.Thanks a lot for transforming my life.One day I will start reporting mri by learning from your vedio only
@radiologytutorials
@radiologytutorials Год назад
I'm really happy it had started to make sense for you Ravi! Thank you for your kind words 😊
@suomynonaanonymous
@suomynonaanonymous Год назад
Thank you this was sooo helpful!
@radiologytutorials
@radiologytutorials Год назад
Yay! I'm glad!
@caizhenqin4604
@caizhenqin4604 9 месяцев назад
Thank you very much. It is important for clinician to get this intuition of MRI. Grateful for this.
@radiologytutorials
@radiologytutorials 8 месяцев назад
Absolutely 👍
@msaoc22
@msaoc22 Год назад
great explanation, thanks a lot!
@radiologytutorials
@radiologytutorials Год назад
Yay! Glad it helped Olga 🙂
@fideletsongo4079
@fideletsongo4079 7 месяцев назад
Great teacher all the time
@ina8449
@ina8449 Год назад
Thank you, very good.🤗
@pallavi2109
@pallavi2109 Год назад
that is an excellent explanation!
@radiologytutorials
@radiologytutorials Год назад
Thank you Pallavi ☺️
@bhaskarsharma6070
@bhaskarsharma6070 Год назад
Excellent 👌
@masnla
@masnla Год назад
This helped me understand diffusion a lot. Thank you for preparing this! 😍
@radiologytutorials
@radiologytutorials Год назад
Thank you Masnla. I'm so glad it was helpful!
@AC9003
@AC9003 Год назад
Amazing, thank you!🙏
@radiologytutorials
@radiologytutorials Год назад
Yay! Glad it helped Anita 🙂
@studywithdoctor823
@studywithdoctor823 Год назад
Pls make one video of mri sequences in detail..btw ur videos r awesome ..Ty so much
@irishummel2983
@irishummel2983 Год назад
REALLY good, thanks
@radiologytutorials
@radiologytutorials Год назад
Thank you Iris 😊
@gregorysnyder4018
@gregorysnyder4018 Год назад
Well done!
@radiologytutorials
@radiologytutorials Год назад
Thanks Gregory!
@sids6208
@sids6208 2 месяца назад
Amazing, thank you. How do you describe and interpret lesions that are high on DWI but isointense on ADC?
@greggsmith6430
@greggsmith6430 Год назад
Hi Michael, Great video again thank you very much. Please could you do more interpreting videos e.g. MRI findings in acute vs chronic stroke etc. ? Thank you
@brad6742
@brad6742 Год назад
Acute Stroke: 1. Diffusion-weighted imaging (DWI): In the acute phase, DWI shows hyperintense (bright) signals, indicating restricted diffusion of water molecules in the affected brain tissue. This is a sensitive marker for early stroke detection. 2. Apparent diffusion coefficient (ADC) map: Corresponding to the DWI, the ADC map shows hypointense (dark) signals in the affected area, indicating reduced water diffusion. 3. T2-weighted imaging (T2WI) and fluid-attenuated inversion recovery (FLAIR): These sequences may show hyperintense signals due to edema and tissue swelling in the affected region. Chronic Stroke: 1. T1-weighted imaging (T1WI): Chronic strokes typically appear as hypointense (dark) areas on T1WI, indicating tissue loss or cavitation in the affected region. 2. T2-weighted imaging (T2WI) and fluid-attenuated inversion recovery (FLAIR): These sequences may show hyperintense signals due to gliosis (reactive glial cell response) and hemosiderin deposition in the affected area. 3. T1-weighted post-contrast imaging: In some cases, chronic strokes may show enhancement or hyperintense signals on post-contrast images, indicating the presence of gliotic tissue or neovascularization. It's important to note that the appearance of stroke lesions on MRI can vary depending on the time elapsed since the onset of the stroke and individual patient factors. These MRI findings are typically assessed by radiologists or neurologists who have expertise in interpreting brain imaging studies.
@Alexlui800
@Alexlui800 Год назад
Excellent 👍
@radiologytutorials
@radiologytutorials Год назад
Thank you Alex 👍🏼
@ina8449
@ina8449 Год назад
Your chanal is one of my favorit !
@radiologytutorials
@radiologytutorials Год назад
Thank you Ina 😊
@user-tl3lo3wp5g
@user-tl3lo3wp5g 11 месяцев назад
Oh I just saw the module on the MRI physics🙌🙌🙌🙌🙌
@cjproductions5572
@cjproductions5572 Год назад
Thank you !!!
@radiologytutorials
@radiologytutorials Год назад
My pleasure 🙏🏻
@kaustabhchakraborty4721
@kaustabhchakraborty4721 Год назад
I was just learning MRI image modalities for a Machine Learning project on brain Stroke detection, and this video was so much more helpful than so many blogs online on the same topic. Thanks man
@radiologytutorials
@radiologytutorials Год назад
Sounds very interesting Kaustabh. Hope the project is going well. I’m glad this video could be of some help. All the best from South Africa 🇿🇦
@mihaimoldo
@mihaimoldo Год назад
TY Dr! Great explanation. One addendum to this could have been greatly useful is the b values, what do they represent and why certain Dr want 1000 or 800 for the same anatomy.
@radiologytutorials
@radiologytutorials Год назад
Thank you Mihai. You're right. I definitely could have included that. Didn't want to confuse the core message. For interest briefly, the b value represents the magnitude and timing of the diffusion gradient we apply. As you've said it is prechosen by the clinician. This choice controls for the degree of observed diffusion. Similar to how TE controls T2 weighting. In my experience the reason certain doctors want different values is based on preference or experience with looking for specific pathology. There may be more nuanced reasons that I have yet to learn. Thank you for watching and taking the time to leave a comment ☺️
@user-gm7is5ip5j
@user-gm7is5ip5j Год назад
You have no idea how much you've helped me!! These concepts have been confusing me for too long. Thank you very much.
@radiologytutorials
@radiologytutorials Год назад
That's great to hear Shiyuan!
@draakashpathak8379
@draakashpathak8379 Год назад
Thanks alot 🙂
@radiologytutorials
@radiologytutorials Год назад
Most welcome 😊
@drbwhit
@drbwhit 5 месяцев назад
outstanding
@arogyashrinkhalawithdrgayatri
@arogyashrinkhalawithdrgayatri 7 месяцев назад
Very nice
@sarvejanasukhinobavunthu712
Pranam 🙏 Thanks a lot Please upload some more topics like MRI sequences and protocols When and why
@radiologytutorials
@radiologytutorials Год назад
Khush Raho Sarvejana. Thank you for watching and taking the time to comment. Many more MRI videos planned. Hopefully more to come in the next few weeks!
@sarvejanasukhinobavunthu712
@@radiologytutorials I thank from bottom of my heart . Sparing your precious time and energy in Imparting knowledge to others is highest point of personal culture. Gurudevo Maheshwara (Teacher is equivalent to God for us ) 🙏
@mogali9283
@mogali9283 10 месяцев назад
Thanks
@radiologytutorials
@radiologytutorials 10 месяцев назад
Wow! Thank you 🙏🏻 really appreciate it!
@amarethantula6579
@amarethantula6579 Год назад
I want to know the relationship between b value and dwi pls. explain for me if you dont mind
@brad6742
@brad6742 Год назад
The b value in diffusion-weighted imaging (DWI) refers to the strength or level of diffusion sensitization applied during the image acquisition. It is a parameter that determines the extent to which the diffusion of water molecules is restricted or attenuated. In DWI, water molecules in biological tissues undergo random thermal motion known as Brownian motion. The diffusion of water molecules can be quantified by applying magnetic gradients during the imaging process. The b value represents the strength and duration of these gradients. A high b value corresponds to stronger diffusion sensitization, resulting in more signal attenuation from the diffusion of water molecules. This is useful for highlighting regions with restricted diffusion, such as areas affected by acute stroke or other pathologies. Conversely, a low b value corresponds to weaker diffusion sensitization, allowing a greater contribution from other tissue properties, such as blood flow or perfusion. This can help in assessing different tissue characteristics and distinguishing between various types of pathology. The choice of b value depends on the clinical application and the specific information required. In acute stroke imaging, higher b values (e.g., b = 1000-2000 s/mm²) are commonly used to enhance the visibility of restricted diffusion in the ischemic region. Lower b values (e.g., b = 0-100 s/mm²) are often employed in perfusion-weighted imaging to evaluate tissue perfusion. It's worth noting that the relationship between b value and DWI signal intensity is complex and influenced by various factors, including tissue microstructure and diffusion time. Advanced diffusion models, such as diffusion tensor imaging (DTI), can provide additional information about tissue anisotropy and fiber directionality. Overall, the selection of an appropriate b value in DWI depends on the clinical question, the specific imaging protocol, and the desired balance between diffusion sensitivity and other tissue properties of interest. Radiologists and clinicians use their expertise to optimize the b value selection for different clinical scenarios.
@joekamel3941
@joekamel3941 3 месяца назад
I have a question what would be an example of T2 shine through that would be seen as white on both DWI and ADC ?
@zohebmulla3670
@zohebmulla3670 10 месяцев назад
Sir colon or large intestine ulcers can be seen in MRI?
@000kalla2
@000kalla2 8 месяцев назад
Is this image better for spine to?
@raveeshroy
@raveeshroy Год назад
1:33 DIFFUSION WEIGHTED IMAGE
@ahmed-vl2cr
@ahmed-vl2cr 8 месяцев назад
@Ani.DR.07
@Ani.DR.07 10 месяцев назад
I think it is T2 star and not T2 in that formula.
@NNCCCC63
@NNCCCC63 7 месяцев назад
please speak closer to your microphone
@radiologytutorials
@radiologytutorials 7 месяцев назад
Noted
@jatindersingh3479
@jatindersingh3479 10 месяцев назад
Audio is very low
@radiologytutorials
@radiologytutorials 9 месяцев назад
Yeah, unfortunately my earlier video had low audio
@user-hx8kn4fb6z
@user-hx8kn4fb6z 25 дней назад
Call tumor brain
@victorgrecia
@victorgrecia Год назад
Só foi eu que achei muito prolixo e pouco objetivo?
@dereksocomd
@dereksocomd Год назад
L I F E. S A V E R. 🎉🎉🎉 I have learned this before but still end up forgetting about it. But I cant say the same after watching this. You are amazing Dr. Nel 👏🏼
@radiologytutorials
@radiologytutorials Год назад
Thank you Marc! I also end up forgetting it 😖 at least the video is here for when we inevitably forget again. Appreciate the kind words 🙏🏻
@devinabakshi94
@devinabakshi94 6 месяцев назад
Thanks
@radiologytutorials
@radiologytutorials 6 месяцев назад
Thank you so much!! Really appreciate your support 🤗
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