1.Systematic review and meta-analysis comparing the diagnostic utility of Tc-99m tagged RBC scintigraphy with CT-angiography imaging studies in diagnosing lower gastrointestinal bleeding
Jose Carlos T. Chanyungco ; Ruben V. Ogbac
The Philippine Journal of Nuclear Medicine 2021;16(2):10-22
Background:
Lower Gastrointestinal bleeding (LGIB) is a serious and urgent condition which can be assessed using several
different modalities. Tc-99m tagged RBC scintigraphy has been established as a diagnostic tool in Nuclear
Medicine but several other modalities, including CT-based imaging (i.e. angiography) currently exist.
Objective:
The objective of this study is to compare Tc-99m tagged RBC scintigraphy with CT-based imaging studies in
terms of clinical utility and diagnostic outcomes.
Methods:
A systematic review of available literature was done, with the goal of creating a meta-analysis focusing on the
reported diagnostic outcomes - mainly sensitivity and specificity on the presence of a LGIB. Aside from this, a
systematic review of the clinical utility and the differences of each test were discussed, including
non-quantifiable advantages. The literature search was conducted following the guidelines of PRISMA, with
searches from PubMed, Medline, and other pertinent databases. Quality assurance was done using the
QUADAS tool. Statistical analyses of sensitivity, specificity, and a summary receiver operating characteristics
plot were computed for the meta-analysis.
Results:
Pooled sensitivity and specificity for RBC scintigraphy were 0.886 and 0.119, respectively. Pooled sensitivity and
specificity for CT-based imaging were 0.729 and 0.660, respectively. CT based imaging also showed higher
localization and faster completion times. RBC scintigraphy had a longer acquisition window.
Conclusion
Both Tc99m-tagged RBC scintigraphy and CT-based imaging have important clinical utility, with each modality
having different advantages that the other test cannot provide.
Computed Tomography Angiography
2.Interpolation Algorithm for Motion Vector Field of CTA Image and Accelerated Implementation Based on Uniform Grid and Multi-level B-spline.
Qiang GAO ; Yuan BAO ; Jun ZHAO
Chinese Journal of Medical Instrumentation 2021;45(2):131-135
In order to solve the problems of slow operation speed and low registration accuracy of thin plate spline (TPS) interpolation method for motion vector field in coronary computed tomography angiography (CTA), a multi-level B-spline interpolation method (MBS) with uniform grid is proposed. On the one hand, the interpolation method used local B-spline to refine the sparse mesh layer by layer in a multiscale way to improve the accuracy of registration. On the other hand, it used the splitting matrix method to interpolate the motion vector field, greatly reducing the operation time of interpolation. The experimental results show that the proposed method can be used for CTA image registration efficiently.
Algorithms
;
Computed Tomography Angiography
;
Heart
;
Motion
;
Tomography, X-Ray Computed
3.Preoperative Evaluation of a Subungual Glomus Tumor Case Using Multidetector Computed Tomography Angiography.
Jun XIA ; Yan Xia CAI ; Zhan Qiang JIN ; Xiao Zhen HE ; Yi Ming FAN
Annals of Dermatology 2015;27(2):226-227
No abstract available.
Angiography*
;
Glomus Tumor*
;
Multidetector Computed Tomography*
4.Research Status of Postmortem MSCT Angiography in Forensic Science.
Lei WAN ; Dong Hua ZOU ; Mao Wen WANG ; Ya Hui WANG ; Ping HUANG ; Zheng Dong LI ; Zhi Ling TIAN ; Feng Xiang SONG ; Ning Guo LIU ; Yi Jiu CHEN
Journal of Forensic Medicine 2020;36(6):820-827
Virtual autopsy is a new technique for investigating the morphological changes of cadaveric tissues and organs by medical imaging technology. It has been widely used in the identification of causes of death. Multislice spiral computed tomography (MSCT) has become a routine inspection method in some identification institutions, although it cannot completely replace traditional autopsy, it plays a key auxiliary or substitute role in the identification of certain abnormal causes of death. Plain MSCT scan cannot visualize cadaveric vessels, but can perform cadaveric angiography to determine vascular injury or disease. This technology has entered a rapid development period in recent years, and has made a considerable progress in contrast agent, perfusion methods and imaging methods. This article summarizes several common cadaveric MSCT angiography methods, such as systemic angiography, angiography through cardiopulmonary resuscitation, targeted angiography, and angiography by cardiac puncture, and analyzes and compares the application prospects.
Angiography
;
Autopsy
;
Coronary Angiography
;
Heart
;
Humans
;
Tomography, Spiral Computed
6.MDCT Application in the Vascular System.
Journal of the Korean Medical Association 2007;50(1):25-32
Helical CT has improved with faster gantry rotation, more powerful X-ray tubes, and improved interpolation algorithms; however, the greatest advance has been made by the recent introduction of multi detector-row computed tomography (MDCT) scanners. Fundamental advantages of MDCT include substantially shorter acquisition times, retrospective creation of thinner or thicker sections from the same raw data, and improved threedimensional (3-D) rendering with diminished helical artifacts. While these features will likely be important to many applications of CT scanning, the greatest impact has been on CT angiography. The advantages of MDCT over single detector-row CT scanners when imaging the vascular system can be broken down into three fundamental improvements, that is, speed (faster scan time), distance (longer coverage), and section thickness (better resolution). This article will focus on how the MDCT technology has substantially improved imaging of the vascular system, including pulmonary artery, aorta and extremity vessels.
Angiography
;
Aorta
;
Artifacts
;
Extremities
;
Pulmonary Artery
;
Retrospective Studies
;
Tomography, Spiral Computed
;
Tomography, X-Ray Computed
7.The Usefulness of Three Dimensional Reconstruction Imaging using Spiral CT: an Experience in the Bilateral Wilms` Tumor Surgery.
Byongchang JUNG ; Seung Bae LEE ; Sang Jin YOON ; Seung June OH ; Ahnkie LEE ; In One KIM ; Hwang CHOI
Korean Journal of Urology 1999;40(3):394-397
Conventional angiography has been used to identify detailed vascular anatomy for surgery in which parenchymal salvage should be necessary. Recently, we experienced a case in which 3-dimensional CT was very helpful in salvaging the part of the kidney. A 2 year-old girl was diagnosed as bilateral Wilms` tumor. Conventional CT scan showed right huge mass and left upper pole mass of the kidney. The patient was planned to have neoadjuvant chemotherapy. Spiral CT scan with three-dimensional reconstruction was performed after 3-month chemotherapy and detailed anatomical information regarding vessels, tumor mass and normal parenchyma was obtained. Based on these anatomical information, right radical nephrectomy and left partial nephrectomy was successfully performed. Surgical findings was quite similar to that obtained by preoperative 3-dimensional CT images. Three-dimensional reconstruction of spiral CT imaging is considered to be useful in the evaluation of surgical anatomy in kidney-saving surgery preoperatively.
Angiography
;
Child, Preschool
;
Drug Therapy
;
Female
;
Humans
;
Kidney
;
Nephrectomy
;
Tomography, Spiral Computed*
;
Tomography, X-Ray Computed
8.Assessment of Epicardial Fat Volume With Threshold-Based 3-Dimensional Segmentation in CT: Comparison With the 2-Dimensional Short Axis-Based Method.
Mi Jung PARK ; Jung Im JUNG ; Yong Seog OH ; Ho Joong YOUN
Korean Circulation Journal 2010;40(7):328-333
BACKGROUND AND OBJECTIVES: We aimed to assess the usefulness of a threshold-based, 3-dimensional (3D) segmentation in comparison with the traditional 2-dimensional (2D) short axis-based method for measurement of epicardial fat volume with 64-slice multidetector computed tomography (MDCT). SUBJECTS AND METHODS: One hundred patients (52 males; mean age, 58.36+/-11.0 years) who underwent coronary CT angiography were enrolled in this study. The epicardial fat volume was measured using the two methods. The existing method was the 2D short axis-based method and the new method was the threshold-based 3D segmentation. Pearson's correlation was used to compare the two measurement methods. We also assessed the relationship between the epicardial fat volume and coronary artery disease (CAD). RESULTS: There were a strong correlation between the epicardial fat volumes determined using the two methods (r=0.956, p<0.001). The mean overestimation of epicardial fat volume by the threshold-based 3D method was 59.89+/-12.00% compared to the 2D short-axis based method. Using the 3D method, the epicardial fat volume was significantly higher in the CAD group than in the controls (165.07+/-48.22 cm3 vs. 108.39+/-48.03 cm3, p<0.001). CONCLUSION: Threshold-based 3D segmentation is another easy and useful tool for measuring the epicardial fat volume.
Angiography
;
Coronary Artery Disease
;
Humans
;
Intra-Abdominal Fat
;
Multidetector Computed Tomography
;
Pericardium
;
Tomography, X-Ray Computed
9.Multidetector Row Computed Tomography: 'Principles and Clinical Applications'.
Journal of the Korean Medical Association 2003;46(12):1107-1116
The computed tomography (CT) technology has recently leaped with the advent of the multidetector row technique since the introduction of spiral CT. The most important advantages of multidetector spiral CT (MDCT) are its rapid scan speed and the increased zaxis spatial resolution. MDCT permits selection of high resolution for isometric imaging in any imaging planes, long coverage of study volume, or decreased scan time for clinical purposes and needs. The most widely applied clinical indication of MDCT is CT angiography. MDCT makes a dynamic study or multiphase study easier and more reliable. Combination of isometric imaging in any anatomic planes, CT angiography, multiphase dynamic study, 2or 3dimensional image reconstruction has made radiologic diagnoses more accurate and has provided more useful information for preoperative surgical design and educational purposes. The combined increase of temporal resolution (200 msec) opens the era of cardiac imaging. With its inherent contrast resolution, coronary CT angiogram can reveal atherosclerotic changes of the arterial wall as well as the degree of luminal narrowing. MDCT has provided new opportunities for medical imaging and will expand rapidly with further clinical applications.
Angiography
;
Diagnosis
;
Diagnostic Imaging
;
Image Processing, Computer-Assisted
;
Multidetector Computed Tomography*
;
Phenobarbital
;
Tomography, Spiral Computed
10.Spiral CT of Hepatocellular Carcinoma: Correlation of CT Scans during the Arterial Phase with Angiography.
Han Kyung LEE ; Byung Ihn CHOI ; Joon Koo HAN ; Dae Young YOON ; Jae Min CHO ; Jeong Yeon CHO
Journal of the Korean Radiological Society 1996;34(4):507-512
PURPOSE: To correlate the enhancement pattern of hepatocellular carcinoma during the arterial phase of spiral CT with vascularity on angiography. MATERIALS AND METHODS: Forty-Two patients with hepatocellular carcinoma underwent spiral CT and angioigraphy. spiral CT was performed with a section thickness of 10mm and a table speedof 10 or 13 mm/sec. 120mL of contrast medium was injected at 3 mL/sec. Spiral CT scans during the arterial phase were obtained 35 seconds after the injection of contrast medium. CT findings of 78 lesions less than 4cm indiameter were correlated with angiographic findings. RESULTS: The attenuation of lesions was high(n=69),iso(n=5), and low(n=4) compared with liver parenchyma during the arterial phase of spiral CT. in lesions with high-, iso-, and low-attenuation during the arterial phase of spiral CT, hypervascularity on angiograms was foundin 63 of 69(91.3%), three of five(60%), and three of four lesions(75%), respectively. Six lesions with high-attenuation on the arterial phase of spiral CT were not seen on angiography. Two iso-attenuated and onelow-attenuated lesion were hypovascular on angiograms. CONCLUSION: The results of this study suggest that with some exceptions there was good correlation between the arterial phase of spiral CT and angiography.
Angiography*
;
Carcinoma, Hepatocellular*
;
Humans
;
Liver
;
Tomography, Spiral Computed*
;
Tomography, X-Ray Computed*