Volume and radiation dose of CT Urogram over 5 years: Lessons learnt from a University Hospital

Background: Inferior petrosal sinus (IPS) sampling (IPSS) is a transvenous interventional procedure performed to diagnose Cushing’s disease. The reported IPSS failure rate is approximately 10% because IPS catheter delivery is conducted blindly and is challenging because of IPS anatomical variations. This study aimed to evaluate the usefulness of preprocedural magnetic resonance venography (MRV) for assessing IPS access routes before IPSS. Methods: Nineteen consecutive patients who underwent IPSS at a single university hospital in Japan were retrospectively studied. A preprocedural MRV protocol optimized to visualize the IPS before IPSS was established and utilized in the eight most recent cases. An IPSS procedure was considered successful when bilateral IPS catheterization was accomplished. Patient demographics, IPSS success rate, and radiation dose required during IPSS were compared between two groups: MRV group ( N = 8) and no-MRV group ( N = 11) before IPSS. Results: There were no significant differences in age, sex, and IPSS success rates between the groups. The average radiation dose was 663.6 ± 246.8 (SD) mGy and 981.7 ± 389.5 (SD) mGy in the MRV group and no-MRV group, respectively. Thus, there was a significant reduction in radiation exposure in the MRV group ( p = 0.044). Catheterization of the left IPS was unsuccessful in only one patient in the MRV group owing to IPS hypoplasty, as found on the MRV. Conclusions: Hypoplastic IPSs occur in patients and can complicate IPSS. Preprocedural MRV assessment is useful for understanding venous anatomy and preventing unnecessary intravenous catheter manipulation during IPSS, which involves blind manipulation around the IPS.

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Radiation dose and usage of CTKUB over a 5-year period (2014-2018): Observed trends in a University Hospital

European Urology Supplements ◽

10.1016/s1569-9056(19)33176-8 ◽

2019 ◽

Vol 18 (7) ◽

pp. e3030

Author(s):

A. Pietropaolo ◽

A. Ho ◽

F. Wall ◽

R. Geraghty ◽

T. Bryant ◽

...

Keyword(s):

Radiation Dose ◽

University Hospital

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Readjustment of abdominal computed tomography protocols in a university hospital: impact on radiation dose

Radiologia Brasileira ◽

10.1590/0100-3984.2014.0054 ◽

2015 ◽

Vol 48 (5) ◽

pp. 292-297 ◽

Cited By ~ 4

Author(s):

Ricardo Francisco Tavares Romano ◽

Priscila Silveira Salvadori ◽

Lucas Rios Torres ◽

Elisa Almeida Sathler Bretas ◽

Daniel Bekhor ◽

...

Keyword(s):

Computed Tomography ◽

Radiation Dose ◽

Clinical Suspicion ◽

University Hospital ◽

Abdominal Ct ◽

Abdominal Computed Tomography ◽

Computed Tomography Scans ◽

Group A ◽

Group B ◽

Tomography Scan

AbstractObjective:To assess the reduction of estimated radiation dose in abdominal computed tomography following the implementation of new scan protocols on the basis of clinical suspicion and of adjusted images acquisition parameters.Materials and Methods:Retrospective and prospective review of reports on radiation dose from abdominal CT scans performed three months before (group A – 551 studies) and three months after (group B – 788 studies) implementation of new scan protocols proposed as a function of clinical indications. Also, the images acquisition parameters were adjusted to reduce the radiation dose at each scan phase. The groups were compared for mean number of acquisition phases, mean CTDIvol per phase, mean DLP per phase, and mean DLP per scan.Results:A significant reduction was observed for group B as regards all the analyzed aspects, as follows: 33.9%, 25.0%, 27.0% and 52.5%, respectively for number of acquisition phases, CTDIvol per phase, DLP per phase and DLP per scan (p < 0.001).Conclusion:The rational use of abdominal computed tomography scan phases based on the clinical suspicion in conjunction with the adjusted images acquisition parameters allows for a 50% reduction in the radiation dose from abdominal computed tomography scans.

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