Analysis of medical images in frequency and space-frequency domains ; Medicininių vaizdų analizė ir tyrimas spektriniais metodais

Audgur

Sujets

• Stroke
• Segmentation
• Spectrum
• Wavelet

Informations

• Publié par: vilnius_gediminas_technical_university
• Publié le: 01 janvier 2007
• Nombre de lectures: 48
• Poids de l'ouvrage: 1 Mo

Extrait

VI LNIUS G EDIMI NAS TECHNI CAL UNIVERSITY
of Do gine) gical Scien Summar ssertation g an y2007ctoral Di Technolo ces, Vilnius Electrical En erin d Electronics (01T
DOMAINS
IN FREQUENCY AND SPACE-FREQUENCY
ANALYSIS OF MEDICAL IMAGES
Ev ara s ŽITKEVIČI US Doctoral dissertation w as pre pared at Vilniu s Gedi m ina s Technical Un ivers it y in
07. –20 2003
Scienti fic superv isor
Prof Dr H abil Ro manas MARTAVIČIU S ( l
, Tec S , Ell Eg and E s
The d issertation is being defended at the Cou ncil of Scientific Field of
Electrical E ngineering an d Electronic s at Viln ius Gedi m inas Tec hnical
University:
Chair m a n
Prof Dr Habil Stani slovas ŠT ARAS (Vil niu s Ged i mi nas Technica l
Uni versit y , Technologica l Sci ences, Electrical E n gi neerin g and Electronics –
T). 01
Me mbers:
Prof Dr Habil Gintautas D Z EMYDA (Ins tit ute of Mathe m atic s an d
Infor m a tics, Technological Sc iences, In for m at ics En gi neeri n T), g – 07
Dr Habil Virginija GAI GA LAI TĖ (Vil ni us U ni ve rsit y, Bio m edical
Science s, Medicine – 07B),
Assoc Prof Dr Šarūnas PA ULI K A S (Vil ni us Ge di mina s Technica l
Uni versit y , Technologica l Sci ences, Electrical E n gi neerin g and Electronics –
T) 01
Prof Dr Habil Juliu s SKUD UTI S (Vil ni us Gedi m i nas Te chnica l U ni versit y ,
Technological Scie nces, Elect rical Engi neeri ng a nd Electronics – 01T).
Opponents:
Prof Dr Habil Arūnas LUKOŠEV IČ IUS (Kaunas University o f
Technolog y, Technological Sc iences, Electrical En gineeri n g and Electronics –
T), 01
Assoc Prof Dr Daliu s N A VAKAUSKAS (Viln iu s Ge di mina s Techn ical
Uni versit y , Technological Sc i ences, In for m atic s En gi neerin T). g – 07
The dissertation w ill be defe n ded at the public meeti n g of t he Cou ncil o f Scie nti fic
Field of Electrical E n gineeri ng and Electronics i n t he S enate Ha ll o f Vi lni u s
Gedi mi nas Technical U ni versi t y at 1 p. m. on 14 Septe m ber 2007.
Address: Sa ulėte -10223 Vilnius, kio al. 11, LT Lit h uania.
12; 01 6; fax [phone] +37 952, 4 4 5 27 70 Tel.: +3
e- m ail: doktor@ad m .v gt u.lt
The su m m ar y o f the doctoral dissertation w a s distributed on 13 Au gu st 2007.
A cop y of the doctoral dissertation is available for revie w a t the Librar y of Vil ni us
Gedi mi nas Technical U ni versi t y (Sau lėtek 3 Vilniu io al. 14, LT-1022 s, Lith ua nia).
© Evaras Žit kevič iu s
,
01T).
– lectronic ngineeriectrn icaiencehsnoloUnigvicaerslity
T e c hni caGe d iminas V iln iusVI LNIAUS GE DIMINO TECHNIKOS U NIVERS
elektros ir elektronikos iTechnoloVilnius acijos santr ITETAS 2007 nžinerija (01T) gijos mokslai, auka Daktaro disert
SPEKTRINIAIS METODAIS
YRIMAS IR TMEDICININIŲ VAIALIZĖ ZDŲ AN
Ev ara s ŽITKEVIČI US Disertacija rengta 2003–20m 07 etai s Vil niau s Gedi m ino tec hni kos un ivers itete.
Moksli nis vadovas
prof. habil. dr. Ro m anas M artavičius ( s
Disertacija gina ma Vilniau s Gedi m ino techn i kos uni versiteto Ele ktros i r
elektroni ko s inži nerijos m o k slo kryptie s taryboje:
Pirmininkas
prof. habil. dr. Stanislovas ŠTAR AS (Vil nia us Ge di mino tec h niko s
uni versi tetas, tec) hnolo T gijos 1 m okslai, ele0 ktros ir elektroni kos– inžinerija .
Nariai:
prof. habil. dr. Gi ntautas D Z EMYDA (Mate m ati kos ir i nfor m a tiko s
inst itu tas, tech nologijos mo ksl ai, infor m ati kos inž), 7T inerija – 0
habil. dr. Virginija GAI G ALAI T Ė (Vilnia us uni versit etas, biomedici nos
mo k slai, medici na – 07B),
doc. dr. Šarūnas PAUL IK AS (Vil nia us Gedi m i no tec h niko s uni ver sitetas,
technolo gijos moks lai, elektro s ir elektroni kos i nžinerija – 01T),
prof. habil. dr. Julius SKUDUT IS (Vil niau s Ge di mino tech ni kos
uni versi tetas, tec hnolo gijos m okslai, ele ktros ir elektroni kos inžinerija – 01T).
Oponentai:
prof. habil. dr. Arū nas LUKOŠE VIČ IUS (Ka u no tech nologijos
uni versi tetas, tec hnolo gijos m okslai, ele ktros ir elektroni kos inžinerija – 01T),
doc. dr. Dalius NAVA KAUSKAS (Vil niau s Ge di mino tec hn ikos
uni versi tetas, tec hnolo gijos m okslai, i nfor m ati kos inži . T) nerija – 07
Disertacija bus gi na m a vie ša m e Ele ktros ir elektron ik os inži nerijos mo ksl o
kr ypties tar ybos posėd yje 2 007 m. rugsėjo 14 d. 13 v al. Vilnia us Gedi m in o
techn ikos u niver siteto se nato posėdžių salėje.
Adresas : Sau lėtek -10223 Vilnius, io al. 11, LT Liet u va.
112; 4956; faksas (8 5) 270 0 74 ) 2 (8 5 52, 4 49 27 8 5) Tel.: (
el. paštas doktor@ad m . vgt u.lt
Disertacijos santra uka i šsi u nti nėta 2007 m. ru gpjūčio 13 d.
Disertaciją gali m a peržiūrėti Vilnia us Gedi mi no tec hni kos uni versi teto bibliotekoje
(Saulėte Vilni kio al. 14, LT-10223 us, Liet u va).
VGTU leidy klos „Techni ka “ 1391 mokslo literat ūros knyga.
© Evaras Žit kevič iu s, 2007

universitetas, technologijos mokslai, elektros ir elektronikos inžinerija – 01T) .
technikos Gedimino Vilniau1. Introduction
Relevancy of the work. I m a ge processi ng is quic kl y dev eloping branc h o f
digital sig nal processi n g. I m a ges a s a con ve nien t and hu m an friendl y i nfor m atio n
for m are u sed in m an y fields of li fe and science i ncludi n g medici ne. O ne o f t he
ai ms of m odern medici ne are non -i nva si ve wa y s of diag nos tics. There are nu mber
of no n- in vasi ve m et hods use d in m edical diag nostic s; a m ong t he m m et hods w it h
vis ualizat ion capabilit y are m ost releva nt. These me thods use ultraso und, X -ra y s
either Nuclear Ma gnet ic Reso nance to vi sua lize interior of hu m a n body. Met hods
w it h v is ualizatio n capabilities are most i m porta nt in t he diagnos tics of disease s of
hu m a n brain. Disease s of th e brain mos tl y deve lop as a result of contraction s
(stenosi s) and dilatatio ns (ane ur y s m s) of blood vesse ls. Wh en blood vessel s ha v e
lesion s t hen probability of brain s troke i ncreases becau s e of t hro mbosi s eit her
interna l spill o f blood. After the stro ke ha s occurred it i s esse ntial to describe
precisel y t he diag nosis. The f irst sta ge of dia gnos is i s localization w h ic h ma y be
performed b y Co mp uted To mo graph y ( CT) or Magneti c Reso nance I m a gi n g
(MRI). In t he earl y sta ges of v essels disease s t here i s releva nt Ma g netic Resona nc e
A n giograph y (MR A ) dia g nos tics w h ic h allo w s to eval uat e the le sion s of blood
ves sels. The pro blem of s trok e diagnosis e nco mpas ses vi s u al anal y sis of m ul tiple
slices perfor m ed b y trai ned radiolog y person nel. If t here are sig ns o f regio ns o f
diseases the n i t i s necessar y to eval uate i ts n u m erical c haract eristics that are critical
in select ion of proper treatme n t.
I m age s of CT and M R I are gr a yscale i m a ge s a nd u sual l y th e y are a nal yzed b y
radiologists on displa y eit her on tran sparenc y scree n. Then objects in i m a ges ar e
recognized b y their properties like a verage l u m inos it y o f the region, localizatio n,
shape, di me nsio ns, etc. The process of vis ual recog nitio n is af fected b y m an y
factors. The totalit y o f factors deter m i nes u ncertaint ies of diagnost ics. More and
more o ften t here are used so ft w are u tilitie s i n the a nal y si s of i m age s w h ich help to
lo wer t he uncertai ntie s and speed up the a nal y si s ti m e. Co mpu ter soft w are i n
compariso n w it h traditional vis ual ana l y sis has an adva ntage o f more precise
evalua tion and calc ulation of i m age c haracteristics usi n g f ull d y na m ic range a nd
resolution of i m a ges. Applicat ions of so ft w are cover auto m a tic anal y si s of i m a ges,
calculatio n of areas and vol u m es of lesio ns, deter m i nation of opti m al treat me nt,
planni n g or assisti n g in c hir urgical operation, traini ng o f radiologists.
For m ulation of the proble m . In i m a ge processi ng a nd ana l ysi s t here are used
various m at he m atical approa ches. General l y m et hods m a y be divided by th e
domai n o f processi n g i nto spatial m et hods a nd m et hods w it h coordinate
trans for ms. The mo st i m porta nt a nd act ual are spectral tra ns for m s w h ic h con vert
i m a ge (spatial) do mai n i nto fr equenc y or space- freque nc y d oma in s. These k inds o f
trans for ms gi ve a n adva ntag e in t he anal y s is a nd eval uat ion of periodicit y a nd
stationarit y of si gna ls. Applications of spectral trans for m s in the processin g of CT
and MRI i m a ges are not i nv estiga ted widel y ; t here are o pen question s on ho w
spectra ma y be adopted to enhance or seg m ent t he reg ions o f stroke diseases.
5In the doctoral dissertation there is anal y zed the proble m o f medical i m ag e
processing in the freque nc y and joint space- freque nc y do m ai ns w i th t he ai m o f
evalua tion of capabilitie s of s pectral met hods. The solutio n of problem is based o n
developing o f tec hniq ues a nd algorith m s for detection o f regions o f disea ses or
other specific reg ions o f i m a g es.
The ai m and tas ks of the work. The ai m of the wor k is i nve sti gation o f
m edical i m age processi n g an d anal ys is usi n g freque nc y an