A cholesterol lesion detection approach based on SVD decomposition

Author(s):  
Sana Lafi ◽  
Ali Khalfallah ◽  
Med Salim Bouhlel
2022 ◽  
Vol 27 (1) ◽  
pp. 103-113
Author(s):  
Jiacheng Jiao ◽  
Haiwei Pan ◽  
Chunling Chen ◽  
Tao Jin ◽  
Yang Dong ◽  
...  

1999 ◽  
Vol 38 (04) ◽  
pp. 108-114 ◽  
Author(s):  
H.-J. Kaiser ◽  
U. Cremerius ◽  
O. Sabri ◽  
M. Schreckenberger ◽  
P. Reinartz ◽  
...  

Summary Aim of the present study was to investigate the feasibility of 2-[fluorine-18]-fluoro-2-deoxy-D-glucose (FDG) imaging in oncological patients with a dual head gamma camera modified for coincidence detection (MCD). Methods: Phantom studies were done to determine lesion detection at various lesion-to-background ratios, system sensitivity and spatial resolution. Thirty-two patients with suspected or known malignant disease were first studied with a dedicated full-ring PET system (DPET) applying measured attenuation correction and subsequently with an MCD system without attenuation correction. MCD images were first interpreted without knowledge of the DPET findings. In a second reading, MCD and DPET were evaluated simultaneously. Results: The phantom studies revealed a comparable spatial resolution for DPET and MCD (5.9 × 6.3 × 4.2 mm vs. 5.9 × 6.5 × 6.0 mm). System sensitivity of MCD was less compared to DPET (91 cps/Bq/ml/cmF0V vs. 231 cps/ Bq/ml/cmFOv). At a lesion-to-background ratio of 4:1, DPET depicted a minimal phantom lesion of 1.0 cm in diameter, MCD a minimal lesion of 1.6 cm. With DPET, a total of 91 lesions in 27 patients were classified as malignant. MCD without knowledge of DPET results revealed increased FDG uptake in all patients with positive DPET findings. MCD detected 72 out of 91 DPET lesions (79.1 %). With knowledge of the DPET findings, 11 additional lesions were detected (+12%). MCD missed lesions in six patients with relevance for staging in two patients. All lesions with a diameter above 18 mm were detected. Conclusion: MCD FDG imaging yielded results comparable to dedicated PET in most patients. However, a considerable number of small lesions clearly detectable with DPET were not detected by MCD alone. Therefore, MCD cannot yet replace dedicated PET in all oncological FDG studies. Further technical refinement of this new method is needed to improve image quality (e.g. attenuation correction).


2019 ◽  
Vol 23 (04) ◽  
pp. 392-404 ◽  
Author(s):  
Frances E. Walstra ◽  
Jonathan Hickle ◽  
Peter Duggan ◽  
Rashid Alsharhan ◽  
Nicolas Murray ◽  
...  

Dual-energy computed tomography (DECT) has the potential to detect musculoskeletal pathology with greater sensitivity than conventional CT alone at no additional radiation dose to the patient. It therefore has the potential to reduce the need for further diagnostic imaging or procedures (e.g., joint aspirations in the case of gout or magnetic resonance imaging to confirm undisplaced fractures).DECT is a well-established technique for the detection of gout arthropathy. Multiple newer applications have shown clinical potential including bone marrow edema detection and metal artifact reduction. Collagen analysis, bone marrow lesion detection, and iodine mapping in CT arthrography are areas of possible future application and development.This article outlines 10 tips on the use of DECT imaging of the musculoskeletal system, explaining the technique and indications with practical suggestions to help guide the radiologist.


Author(s):  
Weihai Sun ◽  
Lemei Han

Machine fault detection has great practical significance. Compared with the detection method that requires external sensors, the detection of machine fault by sound signal does not need to destroy its structure. The current popular audio-based fault detection often needs a lot of learning data and complex learning process, and needs the support of known fault database. The fault detection method based on audio proposed in this paper only needs to ensure that the machine works normally in the first second. Through the correlation coefficient calculation, energy analysis, EMD and other methods to carry out time-frequency analysis of the subsequent collected sound signals, we can detect whether the machine has fault.


2020 ◽  
Vol 22 (1) ◽  
pp. 43-46
Author(s):  
Mst Jesmen Nahar ◽  
Md Mahiuddin Matubber ◽  
Md Mahbubur Rahman ◽  
Md Mahbubur Rahman ◽  
Syed Muhammad Baqul Billah ◽  
...  

Background: Carcinoma stomach, a major killer cancer all over the world, is still presenting late in developing countries due to delay in early diagnosis, lack of awareness, infrastructure etc. Objectives: To establish the importance of preoperative evaluation on operability of carcinoma stomach. Methods: Sixty clinically and histopathologically diagnosed ca stomach cases who underwent surgery in department of Bangabandhu Sheikh Mujib Medical University, Dhaka, and Dhaka Medical College Hospital, Dhaka in 2011 were assessed with clinical picture, investigations, preoperative evaluation and peroperative findings were recorded. Z test for proportion was used to assess clinical decision predictability with a p value of :s;0.05 as significant. Results: Male (73.33%) predominant with 2.75:1 male:female ratio was observed. Mobility, fixity and abdominal lymphadenopathy were not well detected through clinical assessment (p=0.001) while ascites, metastasis and Shelf of Slummer were similar in both clinical and operative finding. The endoscopy of upper GIT finding gave a unique picture as the findings were almost same as were found during operation. USG detected a lesser proportion of the clinical condition compared to peroperative condition whereas CT performed better than the USG except for the lesion detection. Though Computed Tomography (CT) detected higher percentage of lesion, metastasis, ascites and lymph node involvement compared to ultrasonogram (USG), it was significantly higher only for lesion detection (p=0.002) and lymph node involvement (p=<0.001). In the similar manner USG assessment of lesion detection (p=<0.001) and lymph node involvement (p=0.003) was significantly low compared to operative finding. When we looked between CT and operative finding only lesion detection was significantly low (p=0.01) indicating CT to be most effective predictor of clinical picture for operative decision. Preoperative plan were mostly not in accordance with peroperative decision except for total gastrectomy. Conclusion: The study indicates weakness in clinical detection and pre-operative plan compared to per-operative finding. Hence combination of clinical feature and investigation tools especially endoscopy of upper GIT combined with CT is recommended to predict a better operative decision. Journal of Surgical Sciences (2018) Vol. 22 (1): 43-46


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