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Koleksiyon [18]
Tam Metin [2]
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Yazar [20]
Yayın Yılı [7]
Konu Başlıkları [20]
Yayıncı [7]
Yayın Dili [2]
Dergi Adı [11]
Classification of diabetic retinopathy disease from Video-Oculography (VOG) signals with feature selection based on C4.5 decision tree

Kaya, Ceren | Erkaymaz, Okan | Ayar, Orhan | Özer, Mahmut

Proceedings | 2017 | 2017 Medical Technologies National Conference, TIPTEKNO 20172017-January , pp.1 - 4

'Diabetes Mellitus (Diabetes)' is a disease based on insulin hormone disorders secreted from the pancreas gland. Clinical findings find out that diabetes causes some diseases in vital organs. 'Diabetic Retinopathy' is one of the most common eye diseases based on diabetes, and it is the leading cause of visual loss resulting from structural changes in the retinal vessels. Recent researches show that signals from vital organs can be used to diagnose diseases in the literature. In this study, the features of horizontal and vertical Video-Oculography (VOG) signals from right and left eye are used to classify non-proliferative and prolif . . .erative diabetic retinopathy disease. 25 statistical features are obtained using discrete wavelet transform with VOG signals from 24 subjects. Feature selection is performed using C4.5 decision tree algorithm from 25 features obtained. The statistical features obtained from C4.5 decision tree and discrete wavelet transform are applied as input to artificial neural networks and the classification performance of the 'Diabetic Retinopathy' disease are compared according to these two methods. Our results show that feature selection by C4.5 decision tree algorithm (96.87%) provides better classification performance than feature extraction with discrete wavelet transform (93.75%). © 2017 IEEE Daha fazlası Daha az

The prediction of pathologic response to neoadjuvant chemotherapy in breast cancer patients: ultrasonography versus 18F-FDG PET/CT

Cakmak, G. Karadeniz | Emre, A. U. | Uslu, R. | Engin, H. | Bahadir, B. | Bakkal, Bekir Hakan

Conference Object | 2019 | BREAST44 , pp.1 - 4

Goals: In the era of neoadjuvant chemotherapy (NAC), the prediction of pathologic response is a major challenge with the potential to modify surgical approach. The aim of the present study was to evaluate the precision of ultrasonography (US) and 18F-FDG-PET/CT for predicting pathologic complete response (ypCR = ypT0, ypN0) after NAC. Methods: A single-institution, retrospective review of a prospectively maintained database was analyzed to identify breast cancer patients treated with NAC. The study included 253 invasive breast cancer patients treated with NAC followed by standard breast and axillary nodal surgery. US and 18F-FDG PET . . ./CT evaluation was done before and after NAC with documentation of clinical complete response. All US studies were interpreted, as “normal” according to the absence of specific characteristics shown to be commonly associated with metastatic involvement both at diagnosis and at the date of operation. 18F-FDG PET/CT scans was termed as negative or positive due to the standardized uptake value. Results: 102 patients (40,3%) achieved pCR and all of whom had a corresponding clinical complete response. Among 134 patients with clinical negative axilla and initial nodal US demonstrating N0 disease, 41.8% had a breast pCR and all of these cases showed no evidence of axillary lymph node metastases after NAC. For 119 patients with initially nod positive disease, 88.2% patients with a breast pCR and 32.3% patients without breast pCR had axillary N0 disease after NAC. Overall sensitivity, specificity, PPV and NPV for prediction of pCR after NAC was found to be 90%, 92%, 90%, 76% for US and 89%, 84%, 81%, 75% for 18F-FDG-PET/CT, respectively. The PPV for predicting axillary status using US alone was 66.1% and for 18 FDG-PET-CT was 55%. Overall accuracy for pCR was found to be 82.6% for US and 78.6% for 18-FDG-PET/CT. The presence of in situ carcinomawas found to be the only significant factor associated with false negative US for pCR. Micrometastatic disease, the size and number of metastatic nodes were significantly associated with false negative PET/CT results for axillary disease. Conclusions: Breast pCR is highly correlated with nodal status after NAC. US is a beneficial tool with the potential of accurate prediction of pCR in up to 80% of patients following NAC. Nevertheless, in cases of rest in situ carcinoma the accuracy of US should be interrogated cautiously. Moreover, in terms of axillary status neither US, nor 18-FDG-PET-CT is highly capable of predicting N0 disease after NAC. Conflict of Interest: No significant relationships Daha fazlası Daha az

Immunohistochemical expression of human herpes virus-8 in the diagnosis of Kaposi's sarcoma

Gün, Banu Doğan | Bahadır, Burak | Gün, Mustafa Özkan | Gönülal, Erdoğan | Kökten, Neslihan | Kandemir, Nilüfer Onak | Karadayı, Nimet

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.533 - 534

WOS: 000249454601291

Heterotopic thyroid tissue presenting as a porta hepatis mass

Kandemir, Nilüfer Onak | Bahadır, Burak | Gül, Aylin Ege | Karadayı, Nimet

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.361 - 361

WOS: 000249454600753

Surgeon performed intraoperative ultrasound accurately predicts margin status after neaoadjuvant chemotheraphy

Çakmak, Güldeniz Karadeniz | Mutlu, Sezgin | Şen, Hazal | Engin, Hüseyin | Bahadır, Burak | Bakkal, Bekir Hakan

Conference Object | 2018 | CANCER RESEARCH78 ( 4 ) , pp.361 - 361

San Antonio Breast Cancer Symposium -- DEC 05-09, 2017 -- San Antonio, TX WOS: 000425489400315

Helicobacter pylori prevalence in gastric adenocarcinoma

Bahadır, Burak | Gün, Banu Doğan | Kertiş, Gürkan | Yurdakan, Gamze | Barut, Figen | Bektaş, Sibel | Özdamar, Şükrü Oğuz

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.236 - 236

WOS: 000249454600361

Intraobserver and interobserver reproducibility of the Fuhrman nuclear grading for renal cell carcinoma

Bektaş, Sibel | Barut, Figen | Bahadır, Burak | Gün, Banu Doğan | Kandemir, Nilüfer Onak | Gül, Aylin Ege | Keser, Sevinç

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.405 - 405

WOS: 000249454600893

The 46,XY complete gonadal dysgenesis with deletion of AZFa region of the Y chromosome

Demirel, Fatma | Dursun, Ahmet | Numanoğlu, Kemal Varın | Pişkin, İbrahim Ethem | Örnek, Zuhal Komşu

Proceedings | 2008 | HORMONE RESEARCH70 , pp.240 - 240

WOS: 000259785600795

The male true hermafroditism with deletions in the AZF region of the Y chromosome

Demirel, Fatma | Dursun, Ahmet | Ermiş, Bahri | Numanoğlu, Kemal Varın | Pişkin, İbrahim Ethem | Polat, Recep

Proceedings | 2008 | HORMONE RESEARCH70 , pp.157 - 157

WOS: 000259785600513

C-kit (CD117) expression in classic Kaposi sarcoma

Kandemir, Nilüfer Onak | Gün, Banu Doğan | Bahadır, Burak | Yurdakan, Garrize | Gün, Mustafa Özkan | Kökten, Neslihan | Özdemir, Nagehan

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.534 - 534

WOS: 000249454601292

Her-2/neu status in breast carcinoma: Correlation of gene amplification by FISH with immunohistochemistry

Bahadır, Burak | Gün, Banu Doğan | Bektaş, Sibel | Çolak, Sacide | Kertiş, Gürkan | Özdamar, Şükrü Oğuz

Proceedings | 2007 | VIRCHOWS ARCHIV451 ( 2 ) , pp.211 - 211

WOS: 000249454600284

Modulation of the oxidative stress and icam-1 levels by metformin in intestinal ischemia/reperfusion injury

Turan, İnci | Özaçmak-Sayan, Hale | Özaçmak, Veysel Haktan | Barut, Figen

Proceedings | 2018 | ACTA PHYSIOLOGICA225 , pp.50 - 50

WOS: 000453220100106

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