Samulski.nl - Maurice Samulski

Promoted!

Maurice Samulski — Thu, 15 Dec 2011 15:25:24 +0000

On 14 december 2011, I successfully defended my PhD thesis against a committee consisting of Nico Karssemeijer and Peter Lucas (as my promoters), Tom Heskes, Mathias Prokop, Boudewijn Lelieveldt, Roland Holland, Frans Vos, Marina Velikova, and Bram van Ginneken.

Just send me an email if you are interested in my work (msamulski at gmail dot com) and want to request a hardcopy of my thesis (for free). Or get it online here or here

Thanks to everyone that was at my defense, and thanks for all the presents. It was an unforgettable day. Click on more to see the photos my fiancée made.

Thesis defense

Maurice Samulski — Tue, 15 Nov 2011 13:09:00 +0000

Finally! After five years of research and article writing, I am glad to announce that I am defending my Ph.D. thesis “Computer Aided Detection as a Decision Aid in Medical Screening” on wednesday, 14th december 2011 at 10.30 in the aula of the Radboud University Nijmegen. You are all welcome to attend this public defense. Afterwards, a reception will take place in the aula.

The thesis has been printed by Ipskamp Drukkers and is currently being shipped out. If you didn’t receive a copy, please send me an email with your address and I’ll make sure you will get a copy. Meanwhile, my thesis and invitation is also available online:

Download thesis and invitation

Texel

Maurice Samulski — Fri, 01 Jul 2011 21:01:46 +0000

It has been a long time very silent on my blog, even though there has been a lot happening in my life. An emigration to Norway, leaving my family, a new employee, writing my thesis, yes, they were busy months. But now I have some time to write a new post again. A post devoted to someone we have a lot of joy with. It’s our border collie pup Texel! We named him after a Dutch island and ofcourse after the sheep-race. He’s playful, smart, energetic and just very fun. And dog trainers agree he is very promising as a sheep dog.

Multiview CAD in TMI

Maurice Samulski — Wed, 23 Feb 2011 21:24:45 +0000

My paper entitled “Optimizing case-based detection performance in a multi-view CAD system for mammography” has been accepted for publishing in IEEE Transactions on Medical Imaging and you can get it from here. It is my second publication, and I’m proud that it is going to appear in the highly ranked journal TMI. This article describes our approach to improve the clinically important case-based detection performance detecting masses in mammograms using a multi-view classifier with an alternative learning rule. Read further for the technical abstract.

When reading mammograms, radiologists combine information from multiple views to detect abnormalities. Most computer-aided detection (CAD) systems, however, use primitive methods for inclusion of multi-view context or analyze each view independently. In previous research it was found that in mammography lesion-based detection performance of CAD systems can be improved when correspondences between MLO and CC views are taken into account. However, detection at case level detection did not improve.

In this paper, we propose a new learning method for multi-view CAD systems, which is aimed at optimizing case-based detection performance. The method builds on a single-view lesion detection system and a correspondence classifier. The latter provides class probabilities for the various types of region pairs and correspondence features. The correspondence classifier output is used to bias the selection of training patterns for a multi-view CAD system. In this way training can be forced to focus on optimization of case-based detection performance. The method is applied to the problem of detecting malignant masses and architectural distortions.

Experiments involve 454 mammograms consisting of 4 views with a malignant region visible in at least one of the views. To evaluate performance, 5-fold cross validation and FROC analysis was performed. Bootstrapping was used for statistical analysis.

A significant increase of case-based detection performance was found when the proposed method was used. Mean sensitivity increased by 4.7% in the range of 0.01-0.5 false positives per image.

London 2011

Maurice Samulski — Sun, 06 Feb 2011 14:32:17 +0000

Me and my fiancée spent a long weekend in London; it is the very first time that we have been to this city. We took the Eurostar high speed train from Brussels to London, and this was a comfortable and reasonably fast way to travel. We have seen just about all the major (touristic) sights, and enjoyed our time. Apart from our hotel at Harrow, which was a disappointment to us. However, the location of the hotel was quite good. It was close to the Underground Tube system, which brought us everywhere, affordable and fast. If I had to choose the best touristic sight we had, I would say the Tower of London. This amazing fortress was also used as a prison in British history. What I didn’t knew is that also the crown jewels are kept here… A must see.

View video of London.

Winter in Norway 2010

Maurice Samulski — Fri, 31 Dec 2010 22:01:31 +0000

Happy new year everyone, or god nytt år as they say in Norway! I spend New Years eve with my fiancée in Norway, together with her friend Camilla and her boyfriend Simen. It was a nice Christmas aftermath, new years celebration and snowy vacation, where I experienced some new activities which Dutchies never do (at least as far as I know), for instance, ice fishing.

Mens broene brenner

Maurice Samulski — Tue, 19 Oct 2010 20:06:48 +0000

Travelled to Norway (again), participating at the music theatre play my fiancee has written for a good cause of the Red Cross. It has been a huge success so far, and the reviews were good.

Click on the read more link to view the photo’s and some video’s.

The sound quality is not great – the video’s are made with a ordinary digital photo camera.

Tonje #1
Tonje #2
Anne-Gudrun #1

More to come later…

My first journal article

Maurice Samulski — Mon, 14 Jun 2010 14:19:56 +0000

Yes!! After almost three years of hard work, I have my first journal article accepted for publication by European Radiology. It is published as open-access, so the article is free for everyone to download as a PDF. The article is entitled: “Using computer-aided detection in mammography as a decision support”. I’m very thrilled with my first publication, and I hope that I am on the right track getting my PhD. My second article about a multi-view CAD system is almost ready to be sent to an other journal for consideration. Read further for the abstract.

OBJECTIVE: To evaluate an interactive computer-aided detection (CAD) system for reading mammograms to improve decision making.
METHODS: A dedicated mammographic workstation has been developed in which readers can probe image locations for the presence of CAD information. If present, CAD findings are displayed with the computed malignancy rating. A reader study was conducted in which four screening radiologists and five non-radiologists participated to study the effect of this system on detection performance. The participants read 120 cases of which 40 cases had a malignant mass that was missed at the original screening. The readers read each mammogram both with and without CAD in separate sessions. Each reader reported localized findings and assigned a malignancy score per finding. Mean sensitivity was computed in an interval of false-positive fractions less than 10
RESULTS: Mean sensitivity was 25.1% in the sessions without CAD and 34.8% in the CAD-assisted sessions. The increase in detection performance was significant (p = 0.012). Average reading time was 84.7 +/- 61.5 s/case in the unaided sessions and was not significantly higher when interactive CAD was used (85.9 +/- 57.8 s/case).
CONCLUSION: Interactive use of CAD in mammography may be more effective than traditional CAD for improving mass detection without affecting reading time.

Barcelona in one day

Maurice Samulski — Fri, 12 Feb 2010 10:32:17 +0000

Being in Spain for the first time, attending the EIBIR winter school, I decided to explore Barcelona a little before flying back to The Netherlands. One day is way too short, but I had to be back in Holland to welcome my girlfriend coming from Norway. One day is short, but still I have been able to see some of the typical touristic attractions Barcelona has to offer. Click on the read more link to see some photo’s, and hopefully I’m going back to Spain with my girlfriend in the summer.

EIBIR Winter School 2010 – Viladrau

Maurice Samulski — Tue, 26 Jan 2010 15:05:47 +0000

I’ve been to the EIBIR Winter School that took place from January 17 – 22, 2010 in Viladrau, Spain to learn a lot about biomedical imaging research focused on the two leading causes of death worldwide: cardiovascular and oncologic diseases. During the five days, there were a lot of intense lectures hosted in the Hostal de la Gloria, Viladrau. To break the week, we also had a very nice excursion: a walk through the forest with a guide that took us to the house of one of the most famous bandits: Serrallonga. After the heavy week of studying, we finished our stay in Viladrau and went up into the Turo de l’Home ( ‘mountain man’ in Castilian), which is the highest mountain in the Montseny massif with a height of 1712 meters.