Robert Marks, MD, FACR, FSAR

Ohtani not the guy to hit? But it's okay to hit Tatis? GTFOOH.

Thanks!

Fun night becoming a Fellow of the American College of Radiology last night. Congrats to all the new Fellows!

Attenuation Coefficient for Hepatic Steatosis Using a Single Ultrasound System: Associations of Measurement Parameters With Interoperator Agreement and Diagnostic Performance | AJR Background: Clinical adoption of ultrasound attenuation coefficient (AC) measurements has been hindered by lack of uniform measurement protocol and a range of factors that may cause variability. Objective: To evaluate associations of ROI depth, ROI size, and confidence map threshold with interobserver agreement and diagnostic performance of ultrasound AC measurements in detecting and grading hepatic steatosis using MRI proton-density fat fraction (PDFF) as the reference standard. Methods: This prospective study enrolled adults with known steatosis or at risk for steatosis from October 2023 to August 2024. One of two operators obtained videos of AC acquisitions using a single ultrasound unit. Both operators independently reviewed all videos and placed circular ROIs to obtain AC measurements for all 24 possible combinations of four ROI depths (2.0, 2.5, 3.0, and 4.0 cm from liver capsule to ROI outer edge), three ROI sizes (3.0, 3.5, and 4.0 cm), and two confidence map thresholds (20% and 40%). Participants underwent MRI PDFF measurement as reference. Results: The analysis included 101 participants (mean age, 54.5±12.1 years; 62 female, 39 male). Interoperator agreement was excellent for all combinations (intraclass correlation coefficient: 0.92-0.98). AC measurements showed strongest correlations (Spearman rho, 0.81 and 0.80 for operators 1 and 2, respectively) with MRI PDFF at a ROI depth of 4.0 cm. The optimal combination considering correlations with MRI PDFF and AUC across steatosis grades included a depth of 4.0 cm, size of 4.0 cm, and threshold of 40%. This combination had AUC for detecting steatosis with grade >0, >1, and >2 for operator 1 of 0.93, 0.88, and 0.81, respectively, and operator 2 of 0.92, 0.86, and 0.81, respectively. However, accuracy for detecting steatosis (grade >0) was highest for the combination of depth of 3.0 cm, size of 4.0 cm, and threshold of 40% (operator 1, 90.1%; operator 2, 82.2%). Conclusion: AC measurements showed excellent interoperator agreement across parameter combinations. Correlations with MRI PDFF were strongest at a depth of 4.0 cm. Combinations yielding highest diagnostic performance were identified. Clinical Impact: These results will help determine a standardized optimal protocol for ultrasound AC measurements, facilitating clinical adoption for liver fat quantification.

These results will help determine a standardized optimal protocol for ultrasound AC measurements, facilitating clinical adoption for liver fat quantification.

www.ajronline.org/doi/10.2214/...

YouTube video by Dr. Glaucomflecken How To Explain The Match

@glaucomflecken.bsky.social #medsky #matchday #residency
youtube.com/shorts/BbUKn...

Our rockstar Rebecca Rakow-Penner was awarded California State Assembly District 77 Woman of the Year for her amazing research in women's health. Well-deserved!!!

Check out my new paper in @ajrradiology.bsky.social !

New AJR Accepted Manuscript:

"Beyond the AJR: How Does Noncontrast MRI Compare With Ultrasound For Hepatocellular Carcinoma Surveillance in a Prospective Randomized Trial?"

By Dr @robertmarksmd.bsky.social @ucsdbodyimaging.bsky.social

ajronline.org/doi/10.2214/...

@ajrradiology.bsky.social

Come see our very own Aman Khurana's talk on "CEUS interpretation with focus on Pitfalls” today, at 11:10 am in Tucson Ballroom D. @societyabdrad.bsky.social #SAR2025

Alternatively, come see our own Joy Liau's talk at today 11:10 am on "Renal Transplant: Review of Preoperative and Postoperative Imaging" in Arizona Ballroom 12 @societyabdrad.bsky.social #SAR2025

Don't miss @cvsantil.bsky.social taking on the unknown cases from Ben Wildman-Tobriner and Ghaneh Fananapazir @societyabdrad.bsky.social #SAR2025

Happy New Year from Lake Tahoe!

Or stimulants??? 😂

Body Imaging Journal Club night ...
@robertmarksmd.bsky.social

Coach Prime and staff at Colorado are cooking!

Former Oklahoma DB Makari Vickers commits to Colorado

Awesome party last night!

CU Buffs’ star Travis Hunter claims Heisman Trophy On Saturday, Colorado’s Travis Hunter was announced as the winner of the 90th Heisman Trophy at Lincoln Center in New York City.

Wow. Travis is really one of a kind. #CUBuffs www.dailycamera.com/2024/12/14/c...

Colorado's Travis Hunter named AP Player of the Year Days before the 2024 Heisman Trophy ceremony, Rashaan Salaam already has company.

Full story on Travis Hunter being named AP player of the year, the first of what could be several honors the #CUBuffs star could get today.
denvergazette.com/sports/cu-bu...

#NCAA
Travis Hunter

#GoBuffs

📷 COLORADO UNIVERSITY

Yes! Fun times looking at all the great lights last night!

You may not understand why, but the healthcare insurance and PBM contracts YOU have signed for Tesla, SpaceX , @X, along with CEOs of other big companies , have more impact on healthcare costs and quality of care in this country, than anything you can do with DOGE

There's my friend @aniakielar.bsky.social !

Come check out our new UCSD Body Imaging Account. More information will be coming from this account in the near future. #RadSky #Radiology

Thanks. But seriously no FOMO here. This is what I did yesterday instead...

Nice. Is this a permanent change?

A ton. But not going to #RSNA24 this year. Too cold in Chicago and leaving during Thanksgiving is not my thing anymore.

Let's dominate and get Travis his Heisman Trophy! #HE12MAN @boulderbuffalo.bsky.social #Skobuffs

If you needed even MORE of a reason to switch to Bluesky, China is "troubled" by the fact that they've invested so much time on Twitter buying ads, bots, and influencers... only to see the people they're seeking to manipulate (us) flee the site.
www.semafor.com/article/11/2...

Total B.S. to leave out #HE12MAN

Tough loss. Go beat OK State next week and see what happens! #SkoBuffs