PURPOSE: This paper introduces a computationally inexpensive context-dependent classification of multi-echo MRI with Bayes compound decision model. In order to produce accurate region segmentation especially in homogeneous area and along boundaries of the regions, we propose a classification method that uses contextual information of local neighborhood system in the image. MATERIAL AND METHOD: The performance of the context free classifier over a statistically heterogeneous image can be improved if the local stationary regions in the image are disassociated from each other through the mechanism of the interaction parameters defined at the local neighborhood level. In order to improve the classification accuracy, we use the contextual information which resolves ambiguities in the class assignment of a pattern based on the labels of the neighboring patterns in classifying the image. Since the data immediately surrounding a given pixel is intimately associated with this given pixel, then if the true nature of the surrounding pixel is known this can be used to extract the true nature of the given pixel. The proposed context-dependent compound decision model uses the compound Bayes decision rule with the contextual information. As for the contextual information in the model, the directional transition probabilities estimated from the local neighborhood system are used for the interaction parameters. RESULTS: The context-dependent classification paradigm with compound Bayesian model for multi-echo MR images is developed. Compared to context free classification which does not consider contextual information, context-dependent classifier show improved classification results especially in homogeneous and along boundaries of regions since contextual information is used during the classification. CONCLUSION: We introduce a new paradigm to classify multi-echo MRI using clustering analysis and Bayesian compound decision model to improve the classification results.
Bays* ; Classification* ; Magnetic Resonance Imaging* ; Residence Characteristics

The management of subtrochanteric fracture of the femur is one of the most difficult problems. Subtrochanteric area is predominantly composed of cortical bone and highly concentrating portion of stress. So, there is high incidence of Complication after treatment of subtrochanteric fractures. The results were as follows :l. Of 56 cases, 45 occurred in male, 11 in female. 2. The fractures occured mainly between 20 to 40 years of age(55.4%) and mean age was 41.4 years. 3. The most common cause of fracture was traffic accident.(67.9%) 4. According to the Seinsheimer classification, 16 cases were type IIb(most common), 13 type IIIa and 9 type IIIb. 5. 49 cases with treated wutg open reduction and internal fixation and 7 cases conservatively. 6. The average weight bearing time was 14.0 weeks; 13 weeks in operatively treated group and 18.3 week in conservative group. 7. Radiological union was obtained in average 25.1 weeks ; shortest group was type IIc(16 weeks) and longest group was type IV(30 weeks). 8. Complication were as follows; 8 cases of delayed union, 3 nonunion, 4 metallic failures, 7 varus deformities and 1 nail migration. 9. In the cases treated by Judet plate or compression hip screw, there was no complications and relatively short duration of bony union than other implants. So, they are one of the good implant for the treatment of subtrochanteric fracture of the femur.
Classification ; Congenital Abnormalities ; Female ; Femur ; Hip ; Hip Fractures ; Humans ; Incidence ; Male ; Weight-Bearing

An isolated granulocytic sarcoma (chloroma) of the left ovary occured in the absence of leukemia in a 12-year-old woman. This lesion is defined as a localized tumor mass composed of immature cells of the granulocytic series. Granulocytic sarcomas can occur at extramedullary sites including ovary but, isolated myelosarcoma in the absence of usual manifestations of AML may be rare and has some difficulties in diagnosis. Contrary to findings in other series, granulocytic sarcoma arising in this nonleukemic patient did not progress to acute leukemia during two years she has been followed.
Child ; Diagnosis ; Female ; Humans ; Leukemia ; Ovary* ; Sarcoma, Myeloid*

BACKGROUND: Propofol has a high incidence of pain with intravenous injection, and different methods have been used to minimize the incidence and severity of this pain. In this study, we have compared the effect of lidocaine pretreatment with that of ketamine pretreatment on propofol injection pain. METHODS: Ninety healthy female patients scheduled for general anesthesia were randomly divided into three groups; saline group (n=30), lidocaine group (n=30) and ketamine group (n=30). Each patient received 2 ml of pretreatment solution (normal saline, 1% lidocaine, 0.5% ketamine) via 18G angiocatheter inserted in the antecubital fossa after applying an arm tourniquet inflated to 50 mmHg. The tourniquet was released 1 minute later, followed by intravenous injection of 2.5 mg/kg of propofol. The assessment of pain was made at the induction of anesthesia and in the recovery room, and the severity of pain was classified as none, mild, moderate, severe by one observer. RESULTS: The severity and incidence of pain diminished significantly in the lidocaine group and the ketamine group compared with the saline group at the induction of anesthesia (p<0.05) and there was no significant difference between the lidocaine group and the ketamine group. We had similar results in the recovery room and one patient from the saline group and the ketamine group had no recall regarding injection pain. CONCLUSION: Intravenous ketamine pretreatment is as effective as intravenous lidocaine pretreatment in alleviating the propofol injection pain.
Anesthesia ; Anesthesia, General ; Arm ; Female ; Humans ; Incidence ; Injections, Intravenous ; Ketamine* ; Lidocaine* ; Propofol* ; Recovery Room ; Tourniquets

No abstract available.
Genitalia* ; Humans ; Male*

A polymer gel dosimeter was fabricated. A 3-dimensional dosimetry experiment was performed in the small field of the photon of the cyberknife. The dosimeter was installed in a head and neck phantom. It was manufactured from the acrylic and it was used in dosimetry. By using the head and neck CT protocol of the CyberKnife system, CT images of the head and neck phantom were obtained and delivered to the treatment planning system. The irradiation to the dosimeter in the treatment planning was performed, and then, the image was obtained by using 3.0T magnetic resonance imaging (MRI) after 24 hours. The dose distribution of the phantom was analyzed by using MATLAB. The results of this measurement were compared to the results of calculation in the treatment planning. In the isodose curve on the axial direction, the dose distribution coincided with the high dose area, 0.76mm difference on 80%, rather than the low dose area, 1.29 mm difference on 40%. In this research, the fact that the polymer gel dosimeter and MRI can be applied for analyzing a small field in a 3 dimensional dosimetry was confirmed. Moreover, the feasibility of using these for the therapeutic radiation quality control was also confirmed.
Antineoplastic Combined Chemotherapy Protocols ; Cytarabine ; Head ; Magnetic Resonance Imaging ; Neck ; Polymers ; Quality Control ; Thioguanine

Interstitial cystitis is prevalent in the 5th decade women, characterized by frequency, urgency and pelvic pain. To diagnose interstitial cystitis, NIH diagnostic criteria was used. Patients underwent overdistention and all patients were evaluated with IPSS symptom score and urodynamic study in preoperative period, post operative(POD) 1 week and 1 month. The age distribution was 4th decade in 1 patient, 5th decade in 3, 6th decade in 2, 7th decade in 4 and then above 7th decade in 2. Symptom durations was less than 7 years in 7 patients, between 7-10 years in 2 and more than 10 years in 3. Changes in bladder irritative symptom score between preop. and POD 1 week, and preop. and POD 1 month were 6.00+/-4.40(p<0.05) and 6.36+/-2.29(p<0.05) with statistical significance, respectively. Changes in obstructive symptom scores were 4.91+/-4.27(P<0.05) and 3.91+/-4.76(P<0.05) with statistical significance. On urodyna-mic study, the volume of first voiding sensation between preop and POD 1 week was 29.45+/-52.04(p>0.05) but statistically insignificant. However, the change between pre op. and POD 1 month was 97.45+/-90.29(p<0.05) with statistical significance. Difference in maximal capacity between preop. and POD 1 week was statistically significant as 87.55+/-126.39(p<0.05). Bladder functional capacity changes between with and without anesthesia was statistically significant(p<0.05) Postop. complications were bladder rupture in 1 case, and hematuria in 12. The results of overdistention was useful in the diagnosis and treatment of interstitial cystitis. Then more evaluation and follow up will be needed.
Age Distribution ; Anesthesia ; Cystitis, Interstitial* ; Diagnosis ; Female ; Follow-Up Studies ; Hematuria ; Humans ; Pelvic Pain ; Preoperative Period ; Rupture ; Sensation ; Urinary Bladder ; Urodynamics

No abstract available.
Humans ; Hyperbilirubinemia, Hereditary* ; Siblings*

No abstract available.
Decompression* ; Ossification of Posterior Longitudinal Ligament*

PURPOSE: Preamplifier and amplifier are very important parts for developing a portable counting or imaging gamma probe. They can be used for analyzing pulses containing energy and position information for the emitted radiations. The commercial Nuclear Instrument Modules (NIMs) can be used for processing these pulses. However, it may be improper to use NIMs in developing a portable gamma probe, because of its size and high price. The purpose of this study was to develop both preamplifier and amplifier and measure their performance characteristics. MATERIALS and Methodes: The preamplifier and amplifier were designed as a charge sensitive device and a capacitor resistor-rsistor capacitor (CR-RC) electronic circuit, respectively, and they were mounted on a print circuit board (PCB). We acquired and analyzed energy spectra for Tc-99m and Cs-137 using both PCB and NIMs. Multichannel analyzer (Accuspec/A, Caberra Industries Inc., Meriden Connecticut, U.S.A) and scintillation detectors (EP-047 (Bicron Saint-Gobain/Norton Industrial EP-047 (Ceramics Co., Ohio, U.S.A) with 2"x2" NaI (T1) crystal and R1535 (Hamamatsu Photonics K.K., Electron Tube Center, Shizuoka-ken, Japan) with 1"x1"NaI (T1) crystal) were used for acquiring the energy spectra. RESULTS: Using PCB, energy resolutions or EP-047 detectors for Tc-99m and Cs-137 were 12.92% and 5.01%, respectively, whereas R1535 showed 13.75% and 5.19% of energy resolution. Using the NIM devices, energy resolutions of EP-047 detector for Tc-99m and Cs-137 were measured as 14.6% and 7.58%, respectively. However, reliable energy spectrum of R1535 detector could not be acquired, since its photomultiplier tube (PMT) requires a specific type of preamplifier. CONCLUSION: We developed a special preamplifier and amplifier suitable for a small sized gamma probe that showed good energy resolutions independent of PMT types. The RESULTS indicate that the PCB can be used in developing both counting and imaging gamma probe.
Connecticut ; Ohio ; Optics and Photonics