1522: Utility of Preoperative 3-D Reconstruction of Pelvic Vasculature using Multi-Detector Spiral CT Scanning in Treatment Planning for Robotic Prostatectomy

2005 ◽  
Vol 173 (4S) ◽  
pp. 412-412
Author(s):  
Ashutosh Tewari ◽  
Assaad El-Hakim ◽  
Peter N. Schlegel ◽  
Mani Menon ◽  
Deirdre M. Coll
Keyword(s):  
Treatment Planning ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Robotic Prostatectomy

Endoluminal Graft Exclusion of a Proximal Para-Anastomotic Pseudoaneurysm following Aortobifemoral Bypass

1997 ◽  
Vol 4 (1) ◽  
pp. 88-94 ◽  
Author(s):  
Rodney A. White ◽  
Carlos E. Donayre ◽  
Irwin Walot ◽  
Eric Wilson ◽  
George Jackson ◽  
...  
Keyword(s):  
Medical Condition ◽  
Ct Scanning ◽  
Abdominal Ultrasound ◽  
Spiral Ct ◽  
Aortobifemoral Bypass ◽  
Anastomotic Pseudoaneurysm ◽  
Left Limb ◽  
Work Up ◽  
Abdominal Ultrasound Examination

Purpose: To describe a case of endoluminal graft exclusion of a proximal para-anastomotic pseudoaneurysm that occurred 17 years following aortobifemoral bypass for occlusive disease. Methods and Results: The lesion was found on abdominal ultrasound examination as part of a work-up for acute abdominal pain and upper gastrointestinal bleeding in a 67-year-old male. A 5-cm saccular pseudoaneurysm was confirmed by preintervention aortography and spiral computed tomography (CT) scanning. Because of the patient's acute symptoms and high-risk medical condition (cardiomyopathy), he was deemed a candidate for endoluminal bypass. At the time of intervention, intravascular ultrasound (IVUS) interrogation identified a 3.5-cm-long separation of the existing aortic graft from the proximal aortic stump with a large pseudoaneurysm. The lesion was isolated and repaired by placement of an aortic-to-right iliac endoluminal bypass, ligation of the left limb of the aortofemoral graft, and femorofemoral bypass to restore blood flow to the lower extremities. Spiral CT scans at 48 hours and 3 months following the procedure confirmed complete isolation of the lesion. Conclusions: This case illustrates the feasibility of endografting for repair of aortic para-anastomotic pseudoaneurysms, and it also highlights the potential role of IVUS imaging in endoluminal graft deployment.

scholarly journals Assessment of Hemodynamics in a Rat Model of Liver Cirrhosis with Precancerous Lesions Using Multislice Spiral CT Perfusion Imaging

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Guolin Ma ◽  
Rongjie Bai ◽  
Huijie Jiang ◽  
Xuejia Hao ◽  
Zaisheng Ling ◽  
...  
Keyword(s):  
Liver Cirrhosis ◽  
Rat Model ◽  
Ct Perfusion ◽  
Precancerous Lesions ◽  
Mean Transit Time ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Control Group ◽  
Hemodynamic Changes ◽  
Multislice Spiral Ct

Rationale and Objectives. To develop an optimal scanning protocol for multislice spiral CT perfusion (CTP) imaging to evaluate hemodynamic changes in liver cirrhosis with diethylnitrosamine- (DEN-) induced precancerous lesions.Materials and Methods. Male Wistar rats were randomly divided into the control group (n=80) and the precancerous liver cirrhosis group (n=40). The control group received saline injection and the liver cirrhosis group received 50 mg/kg DENi.p.twice a week for 12 weeks. All animals underwent plain CT scanning, CTP, and contrast-enhanced CT scanning. Scanning parameters were optimized by adjusting the diatrizoate concentration, the flow rate, and the delivery time. The hemodynamics of both groups was further compared using optimized multislice spiral CTP imaging.Results. High-quality CTP images were obtained with following parameters: 150 kV; 150 mAs; 5 mm thickness, 5 mm interval; pitch, 1; matrix,512×512; and FOV, 9.6 cm. Compared to the control group, the liver cirrhosis group had a significantly increased value of the hepatic arterial fraction and the hepatic artery perfusion (P<0.05) but significantly decreased hepatic portal perfusion and mean transit time (P<0.05).Conclusion. Multislice spiral CTP imaging can be used to evaluate the hemodynamic changes in the rat model of liver cirrhosis with precancerous lesions.

Evaluation of frontal sinus and skull measurements using spiral CT scanning: An aid in unknown person identification

2010 ◽  
Vol 197 (1-3) ◽  
pp. 124.e1-124.e7 ◽  
Author(s):  
Asmaa T. Uthman ◽  
Natheer H. AL-Rawi ◽  
Ahmed S. Al-Naaimi ◽  
Ahmed S. Tawfeeq ◽  
Enas H. Suhail
Keyword(s):  
Frontal Sinus ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Person Identification ◽  
Skull Measurements

Three-dimensional angiography for radiosurgical treatment planning for arteriovenous malformations

2003 ◽  
Vol 98 (3) ◽  
pp. 536-543 ◽  
Author(s):  
Federico Colombo ◽  
Carlo Cavedon ◽  
Paolo Francescon ◽  
Leopoldo Casentini ◽  
Umberto Fornezza ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Imaging Modality ◽  
Treatment Plan ◽  
Three Dimensional ◽  
Ct Scanning ◽  
New Method ◽  
Rotational Angiography ◽  
Content Type ◽  
3D Rotational Angiography ◽  
Fine Print

Object. Radiosurgical treatment of a cerebral arteriovenous malformation (AVM) requires the precise definition of the nidus of the lesion in stereotactic space. This cannot be accomplished using simple stereotactic angiography, but requires a combination of stereotactic biplanar angiographic images and stereotactic contrast-enhanced computerized tomography (CT) scans. In the present study the authors describe a method in which three-dimensional (3D) rotational angiography is integrated into stereotactic space to aid treatment planning for radiosurgery. Methods. Twenty patients harboring AVMs underwent treatment planning prior to linear accelerator radiosurgery. Planning involved the acquisition of two different data sets, one of which was obtained using the standard method (a combination of biplanar stereotactic angiography with stereotactic CT scanning), and the other, which was procured using a new technique (nonstereotactic 3D rotational angiography combined with stereotactic CT scanning by a procedure of image fusion). The treatment plan that was developed using the new method was compared with that developed using the standard one. For each patient the number of isocenters and the dimension of selected collimators were the same, based on the information supplied in both methods. Target coordinates were modified in only five cases and by a limited amount (mean 0.7 mm, range 0.3–1 mm). Conclusions. The new imaging modality offers an easier and more immediate interpretation of 3D data, while maintaining the same accuracy in target definition as that provided by the standard technique. Moreover, the new method has the advantage of using nonstereotactic 3D angiography, which can be performed at a different site and a different time with respect to the irradiation procedure.

The advantages of CT scanning in treatment planning of pelvic malignancies

1977 ◽  
Vol 2 ◽  
pp. 151
Author(s):  
B.A. Schlager ◽  
S.O. Asbell ◽  
A.S. Baker ◽  
D.M. Sklaroff ◽  
H.G. Seydel ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Ct Scanning ◽  
Pelvic Malignancies

Preoperative Sizing of Grafts for Transfemoral Endovascular Aneurysm Management: A Prospective Comparative Study of Spiral CT Angiography, Arteriography, and Conventional CT Imaging

1997 ◽  
Vol 4 (3) ◽  
pp. 252-261 ◽  
Author(s):  
Ivo A.M.J. Broeders ◽  
Jan D. Blankensteijn ◽  
Marco Olree ◽  
Willem Mali ◽  
Bert C. Eikelboom
Keyword(s):  
Imaging Techniques ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Computed Tomographic Angiography ◽  
Radiological Investigation ◽  
Computed Tomographic ◽  
First Choice ◽  
Conventional Ct ◽  
The Impact ◽  
Graft Selection

Purpose: To define the impact of spiral computed tomographic angiography (CTA) with image reconstruction on graft selection for Transfemoral Endovascular Aneurysm Management (TEAM) by comparing it to conventional computed tomography (CT) and contrast arteriography. Methods: Twenty-one candidates for TEAM were included. The diameters of the superior and inferior aneurysm necks and lengths between the graft attachment sites were measured using the three imaging techniques. These measurements and their consequences on graft selection were studied. Results: The difference in length sizing between spiral CTA and arteriography never exceeded 1 cm; however, lengths measured by conventional CT scanning resulted in underestimation of graft length in 91% of patients. Graft diameters were chosen too small in 62% of the patients when based on arteriographic diameter measurements. A graft of similar diameter was selected by spiral CTA and conventional CT scanning in 81% of the patients, while minor oversizing by conventional CT scanning was found in 14%. Conclusions: Neither conventional CT scanning nor arteriography is adequate as a sole preoperative radiological investigation for TEAM graft sizing. Spiral CTA with image processing produces all information required for selection of tho-optimal graft size and should be regarded the method of first choice for this purpose.

Functioning islet cell tumor of the pancreas

1997 ◽  
Vol 38 (1) ◽  
pp. 135-138 ◽  
Author(s):  
M. J. Chung ◽  
B. I. Choi ◽  
J. K. Han ◽  
J. W. Chung ◽  
M. C. Han ◽  
...  
Keyword(s):  
Islet Cell ◽  
Late Phase ◽  
Islet Cell Tumor ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Arterial Phase ◽  
Islet Cell Tumors ◽  
Contrast Enhanced ◽  
Projection Images ◽  
Detection And Localization

Purpose: The purpose of this study was to evaluate the usefulness of dynamic spiral CT, including multidimensional reformation, in the detection and localization of islet cell tumors of the pancreas. Material and Methods: Seven patients with histopathologically proven functioning islet cell tumors of the pancreas were studied with 2-phase contrast-enhanced spiral CT. Scanning of the arterial phase and late phase was started 30 s and 180 s, respectively, after injection of 100 ml of contrast medium at a rate of 3 ml/s. Results: Axial images in the arterial phase depicted the lesions in 5 patients, but in the late phase in only one patient. Multiplanar reformatted images of the arterial phase depicted the lesions in all 7 patients. Maximal intensity projection images demonstrated all lesions with information of their relationship to the vascular structure. Conclusion: Dynamic spiral CT with scanning during the arterial phase and retrospective multidimensional reformation is useful for preoperative detection and localization of small islet cell tumors of the pancreas.

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