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Item Metadata only The application of channelized hotelling observer in lesion detection in hepatic SPECT images(Mahidol University. Mahidol University Library and Knowledge Center, 2008) Tawatchai EkjeenItem Metadata only An evaluation of physical performance of conventional x-ray machine using computed radiography system(Mahidol University. Mahidol University Library and Knowledge Center, 2008) Tipvimol MeechaiItem Metadata only Measurement of radiation exposure in diagnostic x-ray energy range using photostimulable phosphor plate(Mahidol University. Mahidol University Library and Knowledge Center, 2008) Wiwat Owasirikul; Chavalit Wongse-EkItem Metadata only Dosimetric characterization of patients undergoing common radiological examination using IAEA technical report series no.457 protocol : a study of a phantom at Phyathai 2 Hospital(Mahidol University. Mahidol University Library and Knowledge Center, 2009) Tulpreeda Srisa-Ard; Napapong PongnapangItem Metadata only Comparative penumbral widths for small fields of 6 MV photon beam(Mahidol University. Mahidol University Library and Knowledge Center, 2014) Sukesorn Panyawong; Puangpen Tangboonduangjit; Lalida Tuntipumiamorn(EDR2 and EBT2) were used as a reference penumbral width measurement for comparison.AVidar scanner and the ImageJ software were used for film scanning analysis at resolution of 0.36 mm/pixel (71 DPI). The film calibration curves were fitted using a...อ้างอิงในการเปรียบเทียบบริเวณขอบพื้นที่รังสี Vidar scanner และ imageJ software ใช้ในการประมวลผลด้วยความละเอียด 0.36 มิลลิเมตรต่อพิกเซลและใช้สมการ polynomial กำลังสองในการสร้างcalibration curvesของฟิล์ม ค่าต่ำสุดและสูงสุดของบริเวณขอบพื้นที่รังสีที่วัดด้วยItem Metadata only Planning target volume (PTV) margin determination from Marker-based and the Exactrac 6D X-Ray IGRT system in prostate cancer patients(Mahidol University. Mahidol University Library and Knowledge Center, 2018) Siwadol Pleanarom; Lalida Tuntipumiamorn; Pittaya Dankulchai, 936 stereoscopic x-ray images and 271 cone beam computed tomography (CBCT) images from the On-Board Imager system were obtained for the analysis. Data of the setup deviations from three setup techniques, including initial laser setting up, marker...Modern technology, such as intensity modulated and image-guided radiation therapy, have revolutionized radiation treatment with improved outcome and reduced toxicity. However, radiotherapy is a complex process and potential errors can occur in eachItem Metadata only Optimized radiation dose and image quality for abdominal CT protocol : phantom study(Mahidol University. Mahidol University Library and Knowledge Center, 2018) Saimai Siangyai; Malulee Tuntawiroon; Dittapong SongsaengThis study aims to determine the appropriate radiation dose to achieve an acceptable image quality of an abdominal body phantom when varying the Noise Index in the routine abdominal CT scan protocol at Siriraj Diagnostic Imaging Center, using 2 CT... systems, GE Medical System, Model VCT Light Speed and Model HD750. The radiation Noise Index of CT images was measured on standard, large and very large size phantoms. Radiation doses were recorded using fix mode (500 mA) and auto modulation (Noise Index 0Item Metadata only Improvement of Shunt Detection with Arterial Spin-Labeling MR Imaging in Follow-Up of a Treated Cerebral Arteriovenous Malformation(2022-03-01) Piyapittayanan S.; Mahidol Universityof the results of the imaging studies was used to evaluate the diagnostic performance of the MRI technique, with DSA used as the gold standard. Results: Diagnostic accuracy was 94.4% when a positive arteriovenous shunt (AVS) was defined as a high ASL signal... with cerebral AVM was performed. Each patient underwent magnetic resonance imaging (MRI) studies, including pseudo-continuous ASL (pCASL) and conventional cerebral angiography with a digital subtraction angiography (DSA) during a 3-year period. The consensusPublication Metadata only Black-blood vessel wall magnetic resonance imaging – A new imaging biomarker for regrowth of coiled saccular aneurysms?(2021-03-01) Dittapong Songsaeng; Ittichai Sakarunchai; Sasithorn Harmontree; Sakun Mongkolnaowarat; Panida Charnchaowanish; Shuo Zhang; Timo Krings; Philips Healthcare Nederland; University of Toronto; Faculty of Medicine Siriraj Hospital, Mahidol University; Prince of Songkla Universityfor unruptured saccular aneurysm. The relationship between VWI enhancement and aneurysm regrowth was analyzed by Pearson's chi-square test. Diagnostic performance of VWI enhancement in the diagnosis of regrowth aneurysm was determined to compare with digital...Background: Vessel wall imaging (VWI) of cerebral aneurysms is a new tool to risk stratify unruptured aneurysms. We hypothesized that the degree and pattern of aneurysm wall enhancement may predict the regrowth of these aneurysms. The aimPublication Metadata only Malaria parasite detection and cell counting for human and mouse using thin blood smear microscopy(2018-10-01) Mahdieh Poostchi; Ilker Ersoy; Katie McMenamin; Emile Gordon; Nila Palaniappan; Susan Pierce; Richard J. Maud; Abhisheka Bansal; Prakash Srinivasan; Louis Miller; Kannappan Palaniappan; George Thoma; Stefan Jaeger; Harvard School of Public Health; Jawaharlal Nehru University; National Institute of Allergy and Infectious Diseases; Mahidol University; Nuffield Department of Clinical Medicine; University of Missouri-Kansas City; Johns Hopkins Bloomberg School of Public Health; University of Missouri-Columbia; National Library of Medicine; University of Colorado at Bouldersmears. Specifically, using image analysis and machine learning techniques, we process digital images of thin blood smears to determine the parasitemia in each smear. We use a cell extraction method to segment RBCs, in particular overlapping cells. We... show that a combination of RGB color and texture features outperforms other features. We evaluate our method on microscopic blood smear images from human and mouse and show that it outperforms other techniques. For human cells, we measure an absolute