Optimization of CT scans includes limited scanning protocols confined to an anatomic region of interest (e.g., pelvic CT) for evaluation of the distal ureter, adjustments of CT parameters for tissue thickness and body habitus and limitation of phases (e.g., non-contrast only or combined injection and delayed phases) to reduce total radiation
or at 70 sec p.i. 2017-12-21 · CT urography (CT-U) is an established method, which allows assessment of urological malignancies. The study presents a novel protocol of 68Ga-PSMA-11 PET/CT-U in PS and BCR of PC. METHODS: A retrospective review of PSMA PET/CT-U preformed on 57 consecutive patients with prostate cancer. CT urography: definition, CTU may be used as a problem-solving examination. A differential approach using a one-, two- or three-phase protocol is proposed, CT Urography (CTU) • CTU is a multiphase CT examination in which the clinical presentation will largely determine the protocol used. • Because of the multiphasic and functional nature of CTU, the radiation dose can reach high levels, so suggestions for optimized use of CTU with reduced dose have been published by scientific societies.
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The reasoning for using CT urography to investigate hematuria is based on its high diagnostic accuracy for urothelial cell carcinoma (UCC) and favorable comparison with other imaging techniques. CT urography (CT-U) is an established method, which allows assessment of urological malignancies. The study presents a novel protocol of 68Ga-PSMA-11 PET/CT-U in PS and BCR of PC. METHODS: A retrospective review of PSMA PET/CT-U preformed on 57 consecutive patients with prostate cancer. Most CTU protocols are triphasic examinations that include noncontrast, enhanced, and delayed images. 1-3 Noncontrast images extending from the top of the kidneys through the bladder are obtained to evaluate for calculi, fat-containing lesions and parenchymal calcifications, and to provide baseline attenuation for assessment of lesion enhancement. CT Urogram I-/I+ • 2 scans: Noncontrast, Combo Nephrographic/Excretory • Indications: • Optimized study to look at renal parenchyma AND collecting system –Microscopic hematuria –Detecting transitional cell carcinoma (TCC) • Not good for looking at renal (parenchymal based) mass or indeterminate cysts CT Protocols Conventional abdominal CT of the entire urinary tract can be augmented by delayed thin-section images of the contrast-opacified collecting systems, ureters, and bladder 18; the combined examination CT cystography is a variation of the traditional fluoroscopic cystogram.Instead of anterograde opacification of the urinary collecting system (as with CT urography), contrast is instilled retrograde into the patient's bladder, and then the pelvis is imaged with CT. Se hela listan på pubs.rsna.org Conclusion: This expert-based consensus conference provides recommendations to standardise the imaging protocol for computed tomography urography. Key points: • To improve excretory phase imaging, an intravenous injection of furosemide should be performed before the injection of iodinated contrast medium.
Just prior to scanning the patient, give 1-2 cups of water in order to distend the stomach. Split bolus technique: The patient is given 35 mL of intravenous contrast and 100 mL saline after the non-contrast exam, but prior to the imaging of the mixed nephrographic/exretory ("Urogram") phase.
Adv :- no reformatting needed Disadv:- Imaging at different location 6. CTU Protocol –Three phase protocol Unenhanced phase Nephrographic phase after 90-100 secs Pyelographic phase after 12-15 minutes 4 Phase protocol (5 min and 7.5 min) 7. BWH CT Urography Protocol 64 – Channel MDCT with 3 phases Silverman et al Radiology 2006. Problem Imaging the Urothelium It is difficult to obtain a 2012-03-13 · CT urography single bolus protocol for hematuria Siemens SOMATOM Sensation 16 (DOC 41 kb) Supplementary Table 3.
Sudah M, Masarwah A, Kainulainen S, Pitkänen M, Matikka H, Dabravolskaite V, Aaltomaa S, Vanninen R. Comprehensive MR Urography Protocol: Equally Good Diagnostic Performance and Enhanced Visibility of the Upper Urinary Tract Compared to Triple-Phase CT Urography.
Kidney How much dose can be saved in a three-phase CT urography? A combina-tion of normal dose corticomedullary phase with low-dose unenhanced and excretory phases. (In manuscript) IV Dahlman P, Jangland L, Segelsjö M, Magnusson A.: Optimization of Computed Tomography Urography Protocol, 1997 to 2008: Effects on Radiation Dose.
A typical CT urographic protocol has three phases that allow complete evaluation for the most common urologic causes of hematuria, that is, calculi, renal masses, and urothelial tumors (Fig. 1A, 1B ). 2016-06-20 · CT Urogram - Thin sagittal and coronal (3mm x 3mm) of the entire data set, and thick slab (3cm x 3mm) coronal MPR reconstruction should be performed of the opacified renal pelvis, ureters, and bladder. 3D of the collecting system can be performed, as needed or requested. However, in the common sense, to exploit all the potential of this technique, CT urography is understood as a combination of renal CT plus CT of the contrast-enhanced upper urinary tract. Therefore, in most centers, a three-phase CT urographic protocol, consisting of unenhanced, nephrographic, and excretory phases, is performed [ 1 , 3 , 7 ]. Various scanning techniques for CT urography have been described, but there is no universally accepted imaging protocol (3,4).
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The A CT Urogram is a CT exam that takes very thin slice (5mm) images of the urinary system, starting just above the kidneys and ending just below the pubic bone. A CT scan is a non-invasive way of looking inside your body to help diagnose medical conditions and guide treatment. A CT (computed tomography) scanner uses 1 Oct 2019 Methodology: We included 52 consecutive patient in intial audit with pre-existing protocol followed by modified triple split bolus protocol ( 18 May 2019 Computed Tomography (CT) urography carries a high dose of Royal College of Radiologists (RCR) iRefer guidelines (U18 and U19) advise UROLOGICAL SURVEY. Imaging.
The effective dose of CT urography protocol in our study (approximately 20 mSv) was times that of excretory urography ( mSv). CT urography: definition, CTU may be used as a problem-solving examination. A differential approach using a one-, two- or three-phase protocol is proposed,
Se hela listan på en.wikipedia.org
CT urography: Definition, indications and techniques.
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MATERIAL AND METHODS: The study was based on 102 patients (mean age 66.1+/-14.8 years, range 31-89 years; 30 female, 72 male) divided into five groups (groups A-E) corresponding to the time points at which changes were made to the CT urography protocol. The mean effective doses were estimated using the ImPACT CT Patient Dosimetry Calculator.
64 – Channel MDCT with Triple phase and split bolus techniques are most commonly used CTU protocols that consist of a non-contrast, nephrographic, and excretory phase, obtained by 23 Mar 2021 A CT urogram is a test that uses a CT scan and a special contrast medium or dye that a doctor injects into a vein. The contrast dye provides a 29 Mar 2019 CT urogram.
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2017-12-21 · CT urography (CT-U) is an established method, which allows assessment of urological malignancies. The study presents a novel protocol of 68Ga-PSMA-11 PET/CT-U in PS and BCR of PC. METHODS: A retrospective review of PSMA PET/CT-U preformed on 57 consecutive patients with prostate cancer.
Depending on the clinical scenario, multiple phases may not be required, and therefore the radiation dose can be reduced . For example, single-phase nonenhanced CT (not CT urography) is generally adequate to diagnose stones in the acute clinical setting. “The CT urogram is most commonly performed as a three- phase computed tomography technique used to evaluate the kidneys and urinary collecting system. The three phases most commonly include a non-contrast phase, a nephrographic phase scanned at 80 to 120 s delay, and an excretory phase scanned at 10–15 min delay.” studies that CT Urography (CT abdomen and pelvis without and with intravenous contrast) may not be warranted in specific patient cohorts, particularly young individuals without risk factors for urinary tract malignancy, who may be evaluated with a CT exam without contrast only (CT renal stone protocol). CT urography is defined as CT examination of the kidneys, ureters and bladder with at least one series of images acquired during the excretory phase after intravenous contrast administration. The reasoning for using CT urography to investigate hematuria is based on its high diagnostic accuracy for urothelial cell carcinoma (UCC) and favorable comparison with other imaging techniques.