Martin Schiffner 🇪🇺 🇺🇦

ultrasound scientist / electrical & computer engineer / he, him

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

🧵1/5
Do you remember that a dynamic receive aperture with a fixed F-number suppresses grating lobes at the expense of the lateral resolution?
In our new article https://t.co/c0NM2KyBs6, we mitigated this tradeoff in ultrafast plane-wave imaging by a frequency-dependent F-number.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

Do you know what an F-number is?
AND, do you know how a fixed F-number reduces image artifacts?! #ultrasound #fnumber #beamforming #UFFC

[Gijs de Reijke @GijsDeReijke]

Four years of planning the shots paid off.

#EclipseEspaña #Eclipse

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@JulianRoepcke Dazu fällt mir folgendes Zitat ein:

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@AndiKleves @JulianRoepcke Welche kommerziellen Drohnen blockieren denn den Flug?
Laut Gesetz muss die Drohne nur warnen.
Der Marktführer hat die Blockierung schon vor Monaten entfernt (siehe: https://t.co/3E7b1zwFrg).
Bei der Wirkung im vorliegenden Fall gebe ich Ihnen aber recht: Diese wäre zweifelhaft.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@B4557RON4U7 @JulianRoepcke Das schließt sich nicht gegenseitig aus.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@MatinJetztErnst @JulianRoepcke Stimmt.
Drohnen zu bauen oder zu hacken ist aber viel schwerer als ein Kauf. Die meisten Störungen des Flugverkehrs durch kommerzielle Drohnen ließen sich so verhindern. Haftungsausschlüsse braucht es, solange Hersteller den Stand der Technik beim Schutz einhalten.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@JulianRoepcke Wolf Biermann hat es treffend formuliert:

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@Rythmnghost @Thompsonklay @elonmusk Wrong again! Belgium is a founding member of the EU. It is one of the six original countries that established the European Economic Community (the EU's predecessor) in 1958. Verhofstadt was born in 1953 and a little boy at this time. 🤷‍♂️

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@fanny1liy @Thompsonklay @elonmusk There is nothing "pseudo" about the EU Parliament. 😅 It consists of 720 directly elected members that represent 449 million citizens. It co-legislates with the Council (elected national ministers) and can request/reject laws from the Commission (elected by EU Parliament).

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@Thompsonklay @elonmusk Wrong! Unlike DOGE, Steven Witkoff, Jared Kushner etc., the EU parliament is elected regularly.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@RpsAgainstTrump Their vote for Trump reflects a serious lack of political education and self-awareness. Like millions of others, they voted against their interests and will likely repeat this mistake when one of Trump's successors lies to them again

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@docmilanfar "We leave this to another publication."

[Ulugbek S. Kamilov @prof_kamilov]

Excellent tutorial! Thanks for highlighting the CIG work on learning from incomplete measurements
‣ RARE: https://t.co/cJe5Xma301
‣ SelfDEQ: https://t.co/03ZR5bVLmP

Both were done by @Jiaming__Liu, @WeijieGan1, and others, in collab with @an_hongyu.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

🧵5/5
Frequency dependence of the F-number is easy to implement and can improve the lateral resolution of all delay-and-sum-based imaging modes (e.g., synthetic aperture imaging or line-by-line scanning).

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

🧵1/5
Do you remember that a dynamic receive aperture with a fixed F-number suppresses grating lobes at the expense of the lateral resolution?
In our new article https://t.co/c0NM2KyBs6, we mitigated this tradeoff in ultrafast plane-wave imaging by a frequency-dependent F-number.

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

Do you know what an F-number is?
AND, do you know how a fixed F-number reduces image artifacts?! #ultrasound #fnumber #beamforming #UFFC

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

🧵4/5
The frequency-dependent F-number controls the grating lobe amplitudes and reduces image artifacts to a similar extent as a fixed F-number.
The frequency-dependent F-number, however, widens the receive aperture for low frequencies and improves the lateral resolution.

[Paolo Crosetto @PaoloCrosetto]

Ok this is big.

Web of Science just removed the MDPI flagship journal IJERPH from their lists. This means IJERPH has no more an Impact Factor.

Why is this big? What are the implications? 🧵

[Martin Schiffner 🇪🇺 🇺🇦 @3l_mar1aXi]

@drussellpsu @Apple Frequent opportunities to refresh one's memory of keyboard shortcuts ;)