苹果水分与CT值相关性的研究   总被引：8，自引：2，他引：8       下载免费PDF全文

张京平  彭争  汪剑 《农业工程学报》2003,19(2):180-182

利用数值仿真方法研究果蔬干燥过程，含水率的数值计算结果必须得到试验的验证。然而以往的验证都是整体平均值的验证，不是含水率的分布值验证，这就不能证明计算结果的完全正确性，也不能给改进干燥工艺提供有重要价值的参考。为了能够检测果蔬内部含水率的在线分布值，通过试验及对苹果(红富士)CT图片特性的检测、数据分析，发现苹果某点的含水率与其相应CT图片上点的CT值之间、CT图片上的点的RGB值与其CT值之间都存在着显著的线性相关性，从而使我们可通过某点的CT值或RGB值得到该点的含水率。由此找到一条通过CT图像来检测果蔬在线含水率分布的新途径。  相似文献   

CT引导经皮穿刺及X线引导经支气管肺活检对外周肺病灶诊断效果的比较   总被引：5，自引：0，他引：5  

吴升  梁洁芳 《湛江医学院学报》2003,21(2):152-153

目的：比较CT引导经皮肺穿刺肺活检和在X线引导下经支气管肺活检(TBLB)对外周肺病灶的诊断效果。方法：43例外周肺病灶患者均先后行TBLB和CT引导经皮肺穿刺肺活检，分析两种活检术对外周肺病变的诊断效果。结果：43例中CT引导经皮肺穿刺肺活检诊断出5种疾病检出患者38例，诊断率为88．4％(38／43)，而TBLB仅能诊断出1种疾病检出患者2例，诊断率为4．7％(2／43)。两种方法的诊断率差异有非常显著性(P＜0．01)，而两者的并发症差异无显著性(P＞0．05)。结论：CT引导经皮肺穿刺肺活检对外周肺病灶诊断率高，并发症少。  相似文献   

MEASUREMENT OF BODY COMPOSITION IN CATS USING COMPUTED TOMOGRAPHY AND DUAL ENERGY X‐RAY ABSORPTIOMETRY     

LENE E. BUELUND  DORTE H. NIELSEN  FINTAN J. MCEVOY  EILIV L. SVALASTOGA  CHARLOTTE R. BJORNVAD 《Veterinary radiology & ultrasound》2011,52(2):179-184

Dual energy X‐ray absorptiometry (DEXA) is a reference method for assessing body composition but is seldom `accessible in veterinary settings. Computed tomography (CT) can provide similar body composition estimates and we propose that it can be used in body composition studies in animals. We compared CT and DEXA data from 73 healthy adult neutered domestic cats. Three approaches for measuring adipose tissue percentage from full‐body CT scans were explored. By examining the frequency distribution of voxels by Hounsfield unit (HU) value, it is possible to calculate a fat index (Fat%) that is in close agreement with the fat percentages obtained from DEXA scans. Fat% values obtained by the best of the methods had a mean difference of 0.96% (95% confidence interval 0.33–1.59%) from the DEXA results. Fat% obtained by the other two methods were characterized by good correlation but poor agreement and in one of the methods, the difference between the values from the two modalities was proportional to their mean. By using CT, it is possible to obtain body composition estimates that are in close agreement with those available using DEXA. While the significance of individual Fat% measurements obtained from CT can be difficult to interpret and to compare between centers, CT can contribute to research studies concerned either with nutrition or with obesity‐related disorders.  相似文献   

CT Real-time Analysis of Damage Evolution of Coal under Uniaxial Compression   总被引：1，自引：0，他引：1  

YIN Guang zhi  DAI Gao fei  PI Wen li  LI Dong wei 《保鲜与加工》2003,(6):96-100

In order to clarify the mechanism of rockburst, using the specified loading equipment and the CT machine, the real-time computerized tomography testing of coal under the uniaxial compression was completed. Through CT scanning, the clear CT images which included the stage from the microcrack clousre to the microcrack growth, bifurcation, development, failure and the post-failure stage were obtained. According to the CT values, the meso-damage evolution of coal under uniaxial compression was analysed, which provided the basis for the meso-damage evolution.  相似文献   

COMPUTED TOMOGRAPHY DIAGNOSIS OF ISOLATED SPLENIC TORSION IN A DOG     

Michail N.  Patsikas  DVM  PhD  Timoleon  Rallis  DVM  PhD  Stefanos E.  Kladakis  DVM  Aggelos K.  Dessiris  DVM  PhD 《Veterinary radiology & ultrasound》2001,42(3):235-237

Isolated splenic torsion in a dog was diagnosed using computed tomography (CT). The enlarged non enhanced spleen and a twisted soft tissue mass effect represented the rotated pedicle were the main findings. Abdominal radiography and ultrasonography were not conclusive.  相似文献   

AN INTRATHORACIC MALIGNANT PERIPHERAL NERVE SHEATH TUMOR IN A DOG     

Stephanie C.  Essman  DVM  John P.  Hoover  MS  DVM  Robert J.  Bahr  DVM  Jerry W.  Ritchey  DVM  PhD  Christine  Watson  DVM 《Veterinary radiology & ultrasound》2002,43(3):255-259

A 7-year-old, neutered male Labrador Retriever presented for a persistent, productive cough and regurgitation. Radiography, ultrasonography, and computed tomography confirmed a large, smoothly marginated intrathoracic mass causing tracheal compression. The mass was removed via a thoracotomy, and a malignant peripheral nerve sheath tumor, most likely originating from the ventral spinal nerve roots, was confirmed using immunohistochemistry.  相似文献   

CHRONIC SUBDURAL HEMATOMAS AND HYDROCEPHALUS IN A DOG     

Stephanie  Nykamp  DVM  Peter  Scrivani  DVM  Alexander  Delahunta  DVM  PhD  Audrey  Yu-Speight  DVM  R. Rus  DVM 《Veterinary radiology & ultrasound》2001,42(6):511-514

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Preliminary evaluation of serial (18) FDG-PET/CT to assess response to toceranib phosphate therapy in canine cancer     

Leblanc AK  Miller AN  Galyon GD  Moyers TD  Long MJ  Stuckey AC  Wall JS  Morandi F 《Veterinary radiology & ultrasound》2012,53(3):348-357

Palladia(TM) (toceranib phosphate-Pfizer Animal Health) is a novel orally administered receptor tyrosine kinase inhibitor (TKI) approved for treatment of canine mast cell tumors. Receptor tyrosine kinase dysregulation leads to tumor growth, progression, and metastasis. Toceranib's targets include vascular endothelial growth factor receptor (VEGFR-2/Flk-1/KDR), platelet-derived growth factor receptor, and kit. Positron Emission Tomography/Computed Tomography (PET/CT) is used commonly to diagnose, prognosticate, and monitor response to antineoplastic therapy in human patients. In this study, serial PET/CT imaging with (18) F-fluorodeoxyglucose ((18) FDG) was used to assess response to toceranib therapy in dogs with measurable solid malignancies. Six tumor-bearing dogs underwent tumor assessment using both standard RECIST criteria and PET/CT prior to and at a median of 5 weeks postinitiation of toceranib treatment. Toceranib was prescribed initially at a target dose 3.25 mg/kg PO q48 h, with subsequent modifications based on observed toxicity. Treatment was continued in patients achieving stable disease with acceptable drug tolerance. One dog was maintained on drug despite dose modification due to toxicity; measurable clinical and image-based responses were seen after 10 weeks of therapy. All others had stable or progressive disease based on clinical restaging and PET/CT at first recheck. . Due to discordance with anatomic and metabolic imaging, further studies are needed to investigate the role of molecular imaging in assessment of drug response and identify other potential molecular targets of toceranib.  相似文献   

Relationships among subgross anatomy, computed tomography, and histologic findings in dogs with disease localized to the pulmonary acini     

Scrivani PV  Thompson MS  Dykes NL  Holmes NL  Southard TL  Gerdin JA  Bezuidenhout AJ 《Veterinary radiology & ultrasound》2012,53(1):1-10

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Comparison of abdominal computed tomography and abdominal ultrasound in sedated dogs     

Fields EL  Robertson ID  Osborne JA  Brown JC 《Veterinary radiology & ultrasound》2012,53(5):513-517

Abdominal ultrasound (US) is used frequently as a first-line screening tool for abdominal disease. Although computed tomography (CT) is superior to US in the diagnosis of some abdominal diseases, a major impediment is the requirement of general anesthesia to prevent motion and for safe restraint. With multidetector helical CT, faster examinations allow general anesthesia to be avoided, while producing diagnostic-quality images. Abdominal US and CT were compared for lesion detection in 27 sedated dogs, divided into three even groups based on body weight. Lesions were categorized further as to subjective clinical relevance. In dogs less than 25 kg, there is no significant difference in lesion detection between CT and US. In dogs weighing greater than 25 kg, more lesions were detected with CT than with US (P = 0.0001), including clinically relevant lesions (P = 0.0277). From these results, it appears that CT has an advantage in lesion detection in dogs greater than 25 kg, making it a better screening test for abdominal disease in these patients.  相似文献