Purpose: The aim of this study was to examine the effects of attenuation correction (AC) and scatter correction (SC) on the quantification of PET count rates. Materials and Methods: To assess the effects of AC and SC $^{18}F$-FDG PET images of phantom and cat brain were acquired using microPET R4 scanner. Thirty-minute transmission images using $^{68}Ge$ source and emission images after injection of FDG were acquired. PET images were reconstructed using 2D OSEM. AC and SC were applied. Regional count rates were measured using ROIs drawn on cerebral cortex including frontal, parietal, and latral temporal lobes and deep gray matter including head of caudate nucleus, putamen and thalamus for pre- and post-AC and SC images. The count rates were then normalized with the injected dose per body weight. To assess the effects of AC, count ratio of "deep gray matter/cerebral cortex" was calculated. To assess the effects of SC, ROIs were also drawn on the gray matter (GM) and white matter (WM), and contrast between them ((GM-WM)/GM was measured. Results: After the AC, count ratio of "deep gray matter/cerebral cortex" was increased by $17{\pm}7%$. After the SC, contrast was also increased by $12{\pm}3%$. Conclusion: Relative count of deep gray matter and contrast between gray and white matters were increased after AC and SC, suggesting that the AC would be critical for the quantitative analysis of cat brain PET data.
Kim, Euy-Neyng;Sohn, Hyung-Sun;Choi, Jung-Eun;Kim, Sung-Hoon;Chung, Yong-An;Chung, Soo-Kyo;Kim, Choon-Yul
The Korean Journal of Nuclear Medicine
/
v.35
no.1
/
pp.43-51
/
2001
Purpose: In this study, we compared the quantitative characteristics of dynamic salivary gland scintigraphy with static scintigraphy in patients with clinical sicca syndrome using Tc-99m pertechnetate. Materials and Methods: Fifty-two parotid glands and 52 submandibular glands out of 26 patients with clinical sicca syndrome were studied by dynamic and static salivary gland scintigraphy. Ten normal volunteers were also studied as a control group for comparison of scintigraphic parameters. Ten minutes after injection of 370 MBq Tc-99m pertechnetate, we obtained pre-stimulus static images for a few minutes. Then dynamic salivary gland scintigraphy with lemon juice stimulation was performed for 20 minutes. Finally we obtained post-stimulus static images after dynamic images. On dynamic study, functional parameters such as uptake rate, secretion rate and re-uptake rate were calculated. The results of dynamic study and static images were compared. Results: On dynamic study, we could obtain functional parameters of salivary glands successfully. On dynamic study, 22 parotid glands and 22 submandibular glands out of each of 52 glands are abnormal. The static images demonstrated somewhat different results, of which reasons we could assume via dynamic study. Conclusion: Dynamic salivary gland scintigraphy using Tc-99m perechnetate were more functional than static images and might be useful in the assessment of the functional change of the salivary gland in patients with clinical sicca syndrome.
Purpose : Be aware of clinical possibilities on image quality by comparison of contrast-enhanced dynamic CT and MR imaging applied of MIP technique after the experimentally induced clonorchasis infection in dogs. Materials and Method : Twenty mongrel dogs prepared in zoo-laboratory were followed up with serial CT scans and MR imaging for 13 weeks after the experimental infection in liver. Two-phase helical CT was acquired in the supine position with the following scanning parameters. After the injection of contrast material, the arterial phase was initiated using a bolus-racking method. The portal phase scan was started 15 seconds after the arterial phase scan. CT protocol was determined after single level dynamic scans. MR imaging used the CP body coil and images get a 2D image using HASTE, FLASH, TSE pulse sequence. Bile duct MR imaging were obtained in three plans. Then each image was post processed by using target MIP algorithm. Two experimentation above, as a method of evaluation, one pathologist, three radiologist and five radiological technologist were analyzed visually for evaluation of following findings, enhancement of the bile duct wall, dilatation of bile duct tip, liver parenchyma, background suppression. Results : Five dogs was died of a disease after the infection, the rest one else shows the chronic dilatation of the intrahepatic bile duct with CT and MR imaging. Contrast administration of CT shows the contrast-enhanced of the bile duct walls with live parenchyma. MR imaging calculated of CNR and CR from pulse sequence for comparative evaluation and shows the pattern of the intrahepatic bile duct, dilatation of bile duct tip using MIP technique. CNR of the clonorchiasis, HASTE was $16{\pm}0.83$, TSE $7.06{\pm}3.0$, FLASH $1.19{\pm}0.2$ and CR, HASTE was 73.3%, TSE 62.3%, FLASH 6.4%. Conclusion : CT and MR imaging is very usefulness in diagnosis of dog clonorchiasis.
The present study was conducted to investigate the effects of fusion and/or activation protocol on in vitro development of porcine somatic cell nuclear transfer (SCNT) embryos. Porcine fetal fibroblast cells were transferred into the perivitelline space of enucleated in vitro matured oocytes. Cell fusion and activation were induced simultaneous fusion/activation (SA) or delayed activation (DA) with or without cytochalasin B (CB) treatment with electic pulses in 0.28 M mannitol-based medium. The SCNT embryos were cultured in vitro for 7 days and stained with Hoechst 33342 to determine the number of nuclei. After 7 days culture, cleavage and blastocyst formation rates were 72.4% and 7.6% in SCNT and 76.3% and 20.4% in parthenotes. To examine the effect of electric field strengths on development of SCNT embryos, oocytes were fused two pulses of 110 V/mm, 130 V/mm or 150 V/mm for 30 sec post-injection. The fusion and cleavage rates in 130 V/mm group (70.2% and 72.6%) and 150 V/mm group (72.6% and 70.5%) were higher (P<0.05) than 110 V/mm group (47.1% and 48.6%), respectively. However, the rate of embryos developing to the blastocyst stage (8.1%, 9.7% and 10.7%) were not different among three groups. The cleavage rates and the blastcyst formation rates were not different among three treatment groups (SA group, 71.4% and 9.7%; SA+CB treatment group, 74.7% and 8.0%; DA+CB treatment group, 70.8% and 11.2%, respectively). And, no different in the number of cells in blastocysts was observed among the three groups (22.5$\pm$12.8, 23.3$\pm$11.2 and 21.6$\pm$10.4, respectively). These result suggest that two pulses of 130 V/mm or 150 V/mm for 30 sec with SA treatment or DA treatment are enough for fusion/activation of porcine somatic cell nuclear transfer (SCNT) embryos to develop to the blastocyst stage.
Objectives: Recently, $[methyl-^{11}C]-({\beta}$-Hydroxyethyl)trimethylammonium ($[^{11}C]$choline) Has been discovered to be a very effective tracer in imaging various human tumors using positron omission tomography. Because of the short half-life of C-11, it is very difficult to use in a routine imaging procedure and needs a frequent synthesis of $[^{11}C]$choline. This can be supplemented by the substitution of $[^{11}C]$choline with $[methyl-^{18}F]$fluorocholine. Here, we would like to report ceil uptake and biodistribution of $[^{11}C]$choline and $[^{18}F]$fluorocholine as a basic study. Methods: $[^{11}C]$Choline was prepared by the treatment of $[^{11}C]CH_3I$ with N,N-dimethylaminoethanol and $[^{18}F]$fluorocholine was synthesized from reaction of $CH_2Br[^{18}F]F$ with N,N-dimethylaminoethanol. The radiochemical purity was checked by high performance liquid chromatography (HPLC). The blodistribution of $[^{11}C]$choline and $[^{18}F]$fluorocholine was determined in balb/c mouse at 5 min, 20 min, 40 min and 80 min. The cell uptake was measured using glioma (9L) and colon adenocarcinoma (SW620). Results: The radiochemical purity was more than 98% after purification. In the liver, uptake did not change over time; the uptake was 20%ID/g for $[^{11}C]$choline and 13%ID/g for $[^{18}F]$fluorocholine. In the kidney, radioactivity decreased over time; the uptake was 15%ID/g for $[^{11}C]$choline and 20%ID/g for $[^{18}F]$fluorocholine, 80 min post-injection. The cell uptake of $[^{11}C]$choline was 4.93% for glioma (9L) and 18.69% for colon adenocarcinoma (SW620). For $[^{18}F]$fluorocholine, 1.77% for glioma (9L) and 2.77% for colon adenocarcinoma (SW620). Conclusion: $[^{11}C]$Choline and $[^{18}F]$fluorocholine showed a different cell uptake tendency, depending on cancer cell line.
Kim, Seok-Ki;Lee, Dong-Soo;Yeo, Jeong-Seok;Lee, Sang-Kun;Kim, Joo-Yong;Jeong, Jae-Min;Chung, June-Key;Lee, Myung-Chul
The Korean Journal of Nuclear Medicine
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v.33
no.3
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pp.262-272
/
1999
Purpose: Interictal F-18-fluorodeoxyglucose (FDG) PET and ictal Tc-99m-HMPAO SPECT are found to be useful in localizing epileptogenic zones in neocortical lateral temporal or frontal lobe epilepsy. We investigated whether interictal F-18-FDG PET or ictal Tc-99m-HMPAO SPECT was useful to find epileptogenic Bones in occipital lobe epilepsy (OLE). Materials and Methods: We reviewed patterns of hypometabolism in interictal F-18-FDG PET and of hyperperfusion in ictal Tc-99m-HMPAO SPECT in 17 OLE patients (mean age=$27{\pm}6.8$ year, M:F= 10:7, injection time= $30{\pm}17$ sec). OLE was diagnosed based on invasive electroencephalography (EEG) study, surgery and post-surgical outcome (Engel class I in all for average 14 months). Results: Epileptogenic zones were correctly localized in 9 (60%) out of 15 patients by interictal F-18-FDG PET. Epiletogenic hemispheres were correctly lateralized in 14 patients (93%). By ictal Tc-99m-HMPAO SPECT, epileptogenic hemispheres were correctly lateralized in 13 patients (76%), but localization was possible only in 3 patients (18%). Among patients who showed no abnormality with MR imaging and no correct localization with ictal Tc-99m-HMPAO SPECT, interictal F-18-FDG PET was helpful in 2 patients. Conclusion: Ictal Tc-99m-HMPAO SPECT was helpful in lateralization but not in localization in OLE. Interictal F-18-FDG PET was helpful for localization of epileptogenic zones even in patients with ambiguous MR or ictal SPECT findings.
Journal of Korean Academy of Nursing Administration
/
v.5
no.1
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pp.113-136
/
1999
There are some new trends in judgments concerning medical malpractice. which include emphasis on medical professionals' explanation duty in order to materialize patient's rights of self-determination. Now, patient is not a mere subject of medical and nursing care any more, but a subject, participating in medical practice on equal terms with medical professionals. Legal accountability is no limited to nurses in advanced practice: it is a recognized fact of life for every practicing nurse. whether she is an RN employed as a staff nurse in a hospital, a Certified Nurse-Midwife in independent practice or a patient's home. Therefore, it is essential for nurses to be as familiar as possible with the legal guidelines that govern their patient care responsibilities. However there are only a few studies focused on nursing negligence. To define nurse's civil liability in medical malpractice, it is necessary to indentify both legal nursing behaviors and nurse's due care in those nursing behaviors. So this paper focused on nurse's due care, especially in nursing malpractice. To clarify nurses' due care. chapter II has focused on nursing behavior and the scope of nursing practice based on the medical law and health care related study results. Chapter III deals with the content and scope of nurse's due care. Generally. negligence is defined as not doing something which a resonable person. guided by those ordinary considerations which or dinarily regulate human affairs. would do. or doing something which a resonable and prudent man would not do. Next. it describes how we can set the standard of due care in nursing practice. There is objective factors and subjective factors. And we also discuss about the limitation of due care in nursing practice. Finally. chapter IV deals with the case studies related to nursing negligence in the situation of determination. Now', patient is not a mere subject of medical and nursing care any more, but a subject participating in medical practice on equal terms with medical professionals. Legal accountability is not limited to nurses in advanced practice; it is a recognized fact of life for every practicing nurse. whether she is an RN employed as a staff nurse in a hospital. a Certified Nurse-Midwife in independent practice or a patient's home. Therefore, it is essential for nurses to be as familiar as possible with the legal guidelines that govern their patient care responsibilities. However. there are only a few studies focused on nursing negligence. To define nurse's civil liability in medical malpractice, it is necessary to identify both legal nursing behaviors and nurse's due care in those nursing behaviors. So this paper focused on nurse's intravenous injection. post operation nursing care. blood transfusion. and patient nursing care. The result of this paper is as follows. First. there are several cases dealing with nurse's negligence in nursing practice. however, those cases didn't judge nurse's due care based on individual -specific standard but general-objective standard. Second, there is a tendency to put an emphasis on the principal of belief to distinguish who has the liability in the case of medical malpractice among medical care team. So nurses shoud practice nursing care more actively to protect themselves and patients because there is an effort to form professional nurse system and the scope of nursing practice will be deeper and broader. Third, standard of care is a necessary element in establishing negligence. If a nurse is able to meet the standard of care, no breach will be found.
The objective of the present study was to determine the expression of genes associated with lipopolysaccharide (LPS)-induced stressor in two breeds of chickens: the Korean native chicken (KNC) and the White Leghorn chicken (WLH). Forty chickens per breed, aged 40 weeks, were randomly allotted to the control (CON, administered the saline vehicle) and LPS-injected stress groups. Samples were collected at 0 and 48 h post-LPS injection, and total RNA was extracted from the chicken livers for RNA microarray and quantitative real-time polymerase chain reaction (qRT-PCR) analyses. In response to LPS, 1,044 and 1,193 genes were upregulated, and 1,000 and 1,072 genes were downregulated in the KNC and WLH, respectively, using a ${\geq}2$-fold cutoff change. A functional network analysis revealed that stress-related genes were downregulated in both KNC and WLH after LPS infection. The results obtained from the qRT-PCR analysis of mRNA expression of heat shock 90 (HSP90), 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR), activating transcription factor 4 (ATF4), sterol regulatory element-binding protein 1 (SREBP1), and X-box binding protein 1 (XBP1) were confirmed by the results of the microarray analysis. There was a significant difference in the expression of stress-associated genes between the control and LPS-injected KNC and WLH groups. The qRT-PCR analysis revealed that the stress-related $HSP90{\alpha}$ and HMGCR genes were downregulated in both LPS-injected KNC and WLH groups. However, the HSP70 and $HSP90{\beta}$ genes were upregulated only in the LPS-injected KNC group. The results suggest that the mRNA expression of stress-related genes is differentially affected by LPS stimulation, and some of the responses varied with the chicken breed. A better understanding of the LPS-induced infective stressors in chicken using the qRT-PCR and RNA microarray analyses may contribute to improving animal welfare and husbandry practices.
Superovulatory treatment with exogenous gonadotropins adversely affects the uterus through the disruption of the delicate balance of ovarian steroids (estrogens, progestins, androgens). To examine the uterine effects of this treatment, 189 rats were given 4IU, 20IU or 40IU pregnant mare',s serum gonadotropin(PMSG) at 28 days of age and sacrificed every 24h until day 10(D10) post injection. Long term uterine effects were examined in 12 rats treated with 4IU or 40IU PMSG and killed on D30. Adult rat uteri were examined to provide a reference for comparisons. Morphological and histological changes of control (4IU) uteri mimicked those of the adult on a comparable time-course form D2 to D5. Administration of superovulatory doses(20IU, 40IU) of PMSG produced stromal hypertrophy by D2 and focal papillary hyperplasia of the luminal epithelia by D3. Levels of $17{\beta}$-estradiol following 20IU and 40IU PMSG treatment were significantly(p<0.05, p<0.005) elevated above those of controls after D1. Androgen levels of both groups(20IU, 40IU) significantly p<0.05, p<005 increased from baseline on D1 and were maximum between D2 and D3. In the 20IU PMSG group, the hyperplasia gradually regressed after D3 and was absent by D10. The hyperplasia in the 40IU PMSG group, however, had become extensive by D6. It is suspected that preceding elevated levels of estrogen may be responsible for this progressive change. On D 4, the levels of $17{\beta}$-estradiol reached a maximum, which was significantly(p<0.001) greater than both the controls and 20IU PMSG-treated rats. Between D6 and D10, the hyperplasia in 40IU PMSG-treated rats partially regressed. Examination of uteri from D30 revealed no evidence of the hyperplasia. It is suggested that previous exposure to high levels of estrogen and androgens, secondary to superovulation, is possible cause for the observed hyperplasia.
The Journal of the Korean Society for Microbiology
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v.16
no.1
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pp.49-55
/
1981
Recent studies have demonstrated that histamine could have a modulatory influence on the immune response in vitro and in vivo. However, the effect of histamine on immune response in mice has not been extensivley analyzed. In the present study the regulatory effects of cimetidine, a histamine-2-receptor antagonist(H2 blocker) and histamine on the immune response to sheep red blood cells(SRBC) were evaluated in mice. Mice pretreated with daily intraperitoneal injection of varying concentrations of cimetidine for 14 days were immunized intraperitoneally with various concentrations of SRBC($10^6,\;10^7,\;and\;10^8$ cells) and challenged 4 days post immunization. The cellular immune response was determined by measuring the footpad swelling reaction. Footpad swelling reaction of each mouse was measured at 3hr(Arthus) reaction) and 24 or 48 hr(delayed reactions) after challenge. The humoral immune response was determined by measuring hemagglutinins to SRBC. Histamine in varying concentrations($10^{-1},\;10^{-3}\;and\;10^{-5}M$(was added in SRBC suspension at the time of antigen challenge into footpad, and 24-hr delayed type hypersensitivity(DTH) was measured. Cimetidine in varying concentrations(10, 50, 250, 1250 and 6250${\mu}g$) enhanced 24-hr DTH and this enhancement of DTH was more pronounced at 250${\mu}g$ of cimetidine. However, there were no significant differences between the cimetidine-pretreated groups and controls in Arthus reaction and hemagglutinin titers. Histamine suppressed the DTH in the dose-dependent fashion. This suppression was more pronounced at lower concentration of immunizing antigen($10^7\;and\;10^6$ SRBC). However, histamine did not diminish the DTH at higher concentration of antigen($10^8$ SRBC). These results present the evidences which strongly suggest that cimetidine enhances the cell-mediated immune response but not significantlly influences the humoral immune response and that exogenous and endogenous histamine is involved in the modulation of cellular immune response as well as immediate hypersensitivity.
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