barium enema and ct colonography
Computer aided detection of polyps in CT colonography
... In CT colonography, the output from a CT scanner is a typically a stack of hundreds of CT images Bottom: Example of a CT image in the axial orientation, featuring the sigmoid colon and rectum………… ... material intersections that were analyzed and stored beforehand Once a ray detects an intersection, the PVE artifacts can be removed However, matching of intensity profiles is not trivial and it was ... an introduction to the background and motivations of CT colonography, in particular the need for automatic polyp detection We also give a systematic overview, information about the CT data used...
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Computer aided detection of polyps in CT colonography
... In CT colonography, the output from a CT scanner is a typically a stack of hundreds of CT images Bottom: Example of a CT image in the axial orientation, featuring the sigmoid colon and rectum………… ... material intersections that were analyzed and stored beforehand Once a ray detects an intersection, the PVE artifacts can be removed However, matching of intensity profiles is not trivial and it was ... an introduction to the background and motivations of CT colonography, in particular the need for automatic polyp detection We also give a systematic overview, information about the CT data used...
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OBJE CT - Oriented analysis and design
... Thành Phố Hồ Chí Minh nhiệt giúp đỡ chúng em hoàn thành đồ án này! Bài viết đề tài OBJECT-ORIENTED ANALYSIS AND DESIGN Dù thành viên nhóm cố gắng làm việc miệt mài nghiêm túc, song thời gian hạn ... rộng: Khi truyền vào đối tượng Rectangle, assert thành công truyền đối tượng Square, assert không thành công Kết luận: Lớp Square không nên kế thừa từ lớp Rectangle không thoả mản nguyên lí Liskov ... LỊCH SỬ: II HƯỚNG ĐỐI TƯỢNG LÀ GÌ ? Lập trình hướng đối tượng (gọi tắt OOP, từ chữ Anh ngữ object-oriented programming), hay gọi lập trình định hướng đối tượng, kĩ thuật lập trình hỗ trợ công...
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Senate Committee on Banking, Housing, and Urban Affairs, Chairman Chris Dodd (D-CT) docx
... PROTECTION WATCHDOG The new independent Consumer Financial Protection Bureau will have the sole job of protecting American consumers from unfair, deceptive and abusive financial products and practices ... allowed to vote for directors of Federal Reserve Banks; and their past or present officers, directors and employees cannot serve as directors Currently the member banks elect directors, who choose ... clearing houses and traded on exchanges, uncleared swaps will be subject to margin requirements and swap dealers and major swap participants will be subject to capital requirements, and all trades...
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báo cáo hóa học:" SPECT/CT-plethysmography – non-invasive quantitation of bone and soft tissue blood flow" ppt
... Figure SPECT /CT reconstruction with X-ray image showing volume (in ml) and counts in the bone (red) and total limb (green) SPECT /CT reconstruction with X-ray image showing volume (in ml) and counts ... seconds Reconstruction of SPECT data was performed on the processing workstation using scatter correction and attenuation correction (based on attenuation maps derived from the CT image) CT was also ... of an x-ray tube and a set of detectors located opposite the x-ray tube They are mounted on the same gantry and rotate around the patient with the gamma detectors SPECT and CT scan acquired sequentially...
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CT SCANNING – TECHNIQUES AND APPLICATIONS ppt
... the different aspect of the structures at CT needs to be subject of further study 2.8 Dual-source CT Dual-source CT (DSCT) scanners can be used in two different ways for the detection of acute PE ... reconstructed in any direction and the optimal direction is dependent on the patient’s vascular anatomy and the individual findings and therefore should be done individually and not in a standardized ... Comparison of artifacts on coronal reformation and axial CT pulmonary angiography images using single-detector and 4- and 8-detector multidetector-row helical CT scanners Acad.Radiol 2005; 12:602-607...
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THEORY AND APPLICATIONS OF CT IMAGING AND ANALYSIS pdf
... CT Imaging and Analysis (Chapters 10 to 14) Part 5: CT Imaging and Analysis for Non-Medical Applications (Chapters 15 and 16) Parts to are devoted to theories and applications of CT imaging and ... volumetry and contrast impregnation and the fusion of the images obtained by CT and positron emission (PET /CT) The computerized methods for aiding detection and diagnosis, central object of this ... Extracted area #3 (h) Extracted area #4 &&&\\ (e) Extracted area #1 Fig 10 Extracted results for case by the proposed active contour method (a) - (d): Original CT images (e) - (h): Extracted...
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Báo cáo y học: "Plasmatic B-Type Natriuretic Peptide and C-Reactive Protein in Hyperacute Stroke as Markers of Ct-Evidence of Brain Edema." pptx
... the main baseline characteristics and risk factors Table Main baseline characteristics and risk factors N=41 Mean age: 78.32 (SD: 6.77); range: 54-91 Sex: 26 male (634%) and 15 female Mean temperature ... pmol/L and 95.21 respectively), the difference was not statistically significant (p=.69) Figure represents and example of ischemic stroke and hemorrhagic stroke on baseline and delayed CT with ... new brain CT and determined again the CRP and NT-PBNP in the serum because the edema tends to be more evident after this elapse of time By edema in ischemic stroke we mean mass-effect and sulcal...
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báo cáo khoa học: "The role of 18F-FDG-PET/CT in the preoperative staging and posttherapy follow up of gastriccancer:Comparison with spiral CT" docx
... of the PET /CT and CT studies showed completely concordant findings and no additional foci were detected by PET /CT Of these 16 patients, 2/16 were in the first group, 12/16 in Group and 2/16 in ... 2) and 8/42 for recurrence or metastasis search because of tumor marker elevation in the disease free follow up period (Group 3) Groups 1, and included 4, 24 and patients respectively PET /CT and ... tomography and computed tomography (PET /CT) in the preoperative and posttherapy restaging of gastric cancer and to compare with conventional CT Method Patient Group In this retrospective analysis,...
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báo cáo khoa học: "Concomitant pulmonary and thyroid tumors identified by FDG PET/CT and immunohistochemical techniques" ppt
... months FDG PET / CT was performed, and resection specimens of lung and thyroid were detected by hematoxylin eosin staining (HE) and IHC PET / CT: lung tumor SUVmax: 3.69, delay: 5.17; and thyroid ... obtain Consequently, effective therapeutic approaches can be designed and conducted Background Early detection and correct diagnosis are essential for definite treatment and better outcome of cancer ... 19.97, low CT density and ambiguity of the border (Figure 1C) This patient was therefore hospitalized and subjected to a right lung mid lobe lobectomy and mediastinal lymph node dissection According...
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Báo cáo khoa học: "PET-CT staging of the neck in cancers of the oropharynx: patterns of regional and retropharyngeal nodal metastasis" potx
... contributions MT conducted the chart review, data collection, contributed to study design and study co-ordination AG participated helped in chart review, data collection and organization and also helped ... that PET -CT could accurately detect nodal disease in the staging of head and neck cancer patients Furthermore, several studies have already shown that adding PET- FDG or PET /CT- FDG to standard ... routine imaging of head and neck squamous cell carcinoma [21] Additionally, our study highlights the importance and usefulness of pre- treatment PET -CT in detecting RPLN status and its role in guiding...
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Báo cáo khoa học: "Incidental thyroid lesions detected by FDG-PET/CT: prevalence and risk of thyroid cancer" ppsx
... sensitivity and specificity of FDG-PET /CT were 60% and 91% The positive predictive value and negative predictive value of the FDG-PET/ CT was 75% and 83% Jeong HS et al [21] showed that the FDG-PET /CT ... screening subjects and in patients with suspected and known cancer was similar The factors that were related with an increased risk of a malignancy were focal FDG uptake on the FDG-PET /CT and a high ... to suspect malignancy on CT and MRI unless there is invasion into adjacent structures Even though FDG-PET /CT is gradually being used more frequently for cancer staging, localization and surveillance...
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Báo cáo khoa học: "Clinical efficacy and problems with CT lymphography in identifying the sentinel node in breast cancer" docx
... combined application of CTLG and a dye-guided method In two of the patients the CTLG was performed before and after excisional biopsy, and in one patient with bilateral disease CTLG was performed ... 3–5 the CT was repeated SNs were predicted from CT images by identification of enhanced lymph vessels and/ or lymph nodes and assessment of the CT values The CT values of lymph nodes were measured ... follow-up of a randomized trial comparing radical mastectomy, total mastectomy, and total mastectomy followed by irradiation N Engl J Med 2002, 347:567-575 Giuliano AE: Sentinel lymphadenectomy in primary...
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Báo cáo khoa học: "SemiFDG-PET/CT imaging for staging and target volume delineation in conformal radiotherapy of anal carcinoma" potx
... 3.7% GTV and CTV contours changed in 55.6% and 37.0% of cases respectively PET /CT- GTV and PET /CT- CTV, that were used for clinical purposes, were significantly greater than CTGTV and CT- CTV These ... Wilcoxon rank test showed PET-GTV and PET-CTV to be significantly smaller than CT- GTV (p = 1.2 × 10-4) and CT- CTV (p = 2.9 × 10-4) respectively PET /CT- GTV and PET /CT- CTV, that were used for clinical ... given by cisplatin and 5-fluorouracil in 15 cases and mytomicin and 5-fluorouracil in cases Statistical analysis PET-GTV and PET-CTV were respectively compared to CT- GTV and CT- CTV by Wilcoxon rank...
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Báo cáo khoa học: " SemiHypofractionated radiotherapy for lung tumors with online cone beam CT guidance and active breathing control" ppt
... caudal direction, with systematic error of 5.3 mm and random error of 3.7 mm The precorrection errors were similar in LR and AP directions, with the systematic of 3.1 and 3.7 mm and random error ... both SI and AP direction; and random errors of 0.8 mm, 1.2 mm and 1.3 mm in LR, SI and AP direction, respectively After treatment, the tumor positional errors increased compared to post-correction ... SI and AP directions were shown in Fig and Fig It shows that errors in three directions were all decreased with online correction The percentage of pre-correction errors ≤ mm in all three directions...
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Báo cáo khoa học: "Prescreening based on the presence of CT-scan abnormalities and biomarkers (KL-6 and SP-D) may reduce severe radiation pneumonitis after stereotactic radiotherapy" docx
... collected and analyzed data and performed statistical analysis HY and SK-S drafted the manuscript AT, KO, AH, and RW reviewed the data and revised the manuscript KO and KN designed the study and ... radiation therapy) showed greater sensitivity and positive predictive values for RP detection (74% and 68%, respectively) than SP-A (26% and 21%, respectively) [20] Conclusion The frequency of severe ... 3% and log-rank p < 0.0001 & X2 p = 0.0002), SP-D value (1-year; 29% vs 3% and log-rank p = 0.0001 & X2 p = 0.0002), or IP shadow in CT before SBRT (1-year; 57% vs 2% and log-rank p < Figure CT...
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Báo cáo khoa học: "CT-guided iodine-125 seed permanent implantation for recurrent head and neck cancers" doc
... was feasible and accurate for 14 patients with locally recurrent head and neck cancers [42] The 1- and 2-year local control rates were 78% and 57%, respectively, and the actuarial 1- and 2-year ... lasted several days Radium226 and iridium-192 have been used for T1 and T2 patients with oral cavity and oropharynx carcinomas and produced excellent control rates and functional results [29-33] Vikram ... condition of all the patients, hematological and chemical tests, and obtained CT images of the head and neck and radiographs of the chest Patient characteristics are shown in Table Of the 14 patients,...
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Báo cáo khoa học: "F-FDG PET/CT-based gross tumor volume definition for radiotherapy in head and neck Cancer: a correlation study between suitable uptake value threshold and tumor parameters" pdf
... image overlays, fusion of PET and CT images, and PET /CT simulation Since there is less co-registration error between PET and CT using the same DICOM coordinates, PET /CT simulation is a promising ... the manuscript TCH, YCY and KYY collected the PET /CT data and performed analysis SWC, SNY, YCW and JAL were responsible for the evaluation of the patients and the collection of clinical data CRC ... acquire both the CT and PET data in total CT images were obtained at 120 kVp and variable mA (AutomA technique) with 3.75-mm slice The PET data were reconstructed by application of the CT- based attenuation...
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Báo cáo khoa học: "Preimplant factors affecting postimplant CTdetermined prostate volume and the CT/TRUS volume ratio after transperineal interstitial prostate brachytherapy with 125I free seeds" pps
... preimplant factors affecting both postimplant prostate volume by CT and the CT/ TRUS volume ratio Thus, the combination of these two factors can be used to predict postimplant prostate volume by CT and ... TRUS and NHT are significant independent factors affecting both postimplant prostate volume by CT and the CT/ TRUS volume ratio From these results, we have developed regression equations to predict ... postimplant prostate volume by CT and the CT/ TRUS volume ratio NHT was revealed to be a significant preimplant factor affecting both postimplant prostate volume by CT and the increase in prostate...
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Báo cáo khoa học: "[18F]fluoroethylcholine-PET/CT imaging for radiation treatment planning of recurrent and primary prostate cancer with dose escalation to PET/CT-positive lymph node" potx
... volumes [3,4] The potential roles of PET/ CT in radiooncology are (1) patient selection for treatment and (2) target volume selection and delineation, because PET /CT with radiolabelled choline (C11-choline, ... Patient and tumor characteristics Pt Age (yr) stage Gleason iPSA PSA nadir dt PSA (mo.) PSA before FEC PET /CT Previous therpay 73 cT2 cN0 11,5 - 11,5 pos (P) - 59 cT2 cN0 9,1 - 9,1 pos (P) - 64 cT3 ... Survival FEC-PET /CT The PET /CT- studies were positive in 24/26 cases In primary cancer, one patient had bone metastases and bladder infiltration, and one had FEC-uptake in the prostate gland and pelvic...
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