1. Multiscale amplitude-modulation frequency-modulation (AM-FM) texture analysis of ultrasound images of the intima and media layers of the carotid artery
- Author
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Loizou, Christos P., Murray, V., Pattichis, Marios S., Pantzaris, Marios C., Pattichis, Constantinos S., Pattichis, Constantinos S. [0000-0003-1271-8151], Pattichis, Marios S. [0000-0002-1574-1827], Loizou, Christos P. [0000-0003-1247-8573], and Pantzaris, Marios C. [0000-0003-2937-384X]
- Subjects
Male ,Intima-media thickness ,Instantaneous frequency ,Diseases ,Frequency axis ,Image texture ,Modulation frequencies ,middle aged ,Image Processing, Computer-Assisted ,Computer vision ,Ultrasonics ,Segmentation system ,Common carotid artery ,Stroke ,Texture features ,texture analysis ,Ultrasonography ,Gray scale ,adult ,Ultrasound ,Age Factors ,article ,methodology ,Textures ,General Medicine ,Middle Aged ,Cardiovascular disease ,Prefilters ,Computer Science Applications ,Ultrasonic applications ,Amplitude-modulation frequency-modulation (AM–FM) ,aged ,female ,Carotid Arteries ,Low pass filters ,Long axis ,Cardiology ,Ultrasound images ,Engineering and Technology ,Female ,medicine.symptom ,Biotechnology ,Adult ,medicine.medical_specialty ,sex difference ,Medical Engineering ,Texture (music) ,Lower risk ,Asymptomatic ,Amplitude modulation ,High frequency HF ,Edge artifacts ,Texture variation ,Sex Factors ,male ,Internal medicine ,medicine.artery ,Media layers ,medicine ,Humans ,Frequency bands ,Frequency components ,human ,Electrical and Electronic Engineering ,Multiscales ,Amplitude-modulation frequency-modulation (AMFM) ,Aged ,business.industry ,echography ,medicine.disease ,Cardiovascular risk ,image processing ,carotid ,age ,intima-media thickness (IMT) ,Clinical practices ,Artificial intelligence ,Age groups ,business ,Tunica Intima ,Instantaneous amplitude ,Layer components ,Carotid artery ,intima - Abstract
The intima-media thickness (IMT) of the common carotid artery (CCA) is widely used as an early indicator of cardiovascular disease (CVD). Clinically, there is strong interest in identifying how the composition and texture of the media layer (ML) can be associated with the risk of stroke. In this study, we use 2-D amplitude-modulation frequency-modulation (AMFM) analysis of the intima-media complex (IMC), the ML, and intima layer (IL) of the CCA to detect texture changes as a function of age and sex. The study was performed on 100 ultrasound images acquired from asymptomatic subjects at risk of atherosclerosis. To investigate texture variations associated with age, we separated them into three age groups: 1) patients younger than 50 2) patients aged between 50 and 60 years old and 3) patients over 60 years old. We also separated the patients by sex. The IMC, ML, and IL were segmented manually by a neurovascular expert and also by a snake-based segmentation system. To reject strong edge artifacts, we prefilter with an AMFM filterbank that is centered along the horizontal frequency axis (parallel to the long axis of the IMC, ML, and IL), while removing the low-pass filter estimates and frequency bands with large, vertical frequency components. To investigate significant texture changes, we extract the instantaneous amplitude (IA) and the magnitude of the instantaneous frequency (IF) over each layer component, for low-, medium-, and high-frequency AMFM components. We detected significant texture differences between the higher risk age group of 60 years versus the lower risk age group of Cited By :18
- Published
- 2011