Daniel Pinto dos Santos

Radiation exposure in CT-guided interventions

PURPOSE To investigate radiation exposure in computed tomography (CT)-guided interventions, to establish reference levels for exposure, and to discuss strategies for dose reduction. MATERIALS AND METHODS We analyzed 1576 consecutive CT-guided procedures in 1284 patients performed over 4.5 years, including drainage placements; biopsies of different organs; radiofrequency and microwave ablations (RFA/MWA) of liver, bone, and lung tumors; pain blockages, and vertebroplasties. Data were analyzed with respect to scanner settings, overall radiation doses, and individual doses of planning CT series, CT intervention, and control CT series. RESULTS Eighty-five percent of the total radiation dose was applied during the pre- and post-interventional CT series, leaving only 15% applied by the CT-guided intervention itself. Single slice acquisition was associated with lower doses than continuous CT-fluoroscopy (37 mGy cm vs. 153 mGy cm, p<0.001). The third quartile of radiation doses varied considerably for different interventions. The highest doses were observed in complex interventions like RFA/MWA of the liver, followed by vertebroplasty and RFA/MWA of the lung. CONCLUSIONS This paper suggests preliminary reference levels for various intervention types and discusses strategies for dose reduction. A multicenter registry of radiation exposure including a broader spectrum of scanners and intervention types is needed to develop definitive reference levels.

Development of an IHE MRRT-compliant open-source web-based reporting platform

AbstractObjectivesTo develop a platform that uses structured reporting templates according to the IHE Management of Radiology Report Templates (MRRT) profile, and to implement this platform into clinical routine.MethodsThe reporting platform uses standard web technologies (HTML / JavaScript and PHP / MySQL) only. Several freely available external libraries were used to simplify the programming. The platform runs on a standard web server, connects with the radiology information system (RIS) and PACS, and is easily accessible via a standard web browser.ResultsA prototype platform that allows structured reporting to be easily incorporated into the clinical routine was developed and successfully tested. To date, 797 reports were generated using IHE MRRT-compliant templates (many of them downloaded from the RSNA’s radreport.org website). Reports are stored in a MySQL database and are easily accessible for further analyses.ConclusionDevelopment of an IHE MRRT-compliant platform for structured reporting is feasible using only standard web technologies. All source code will be made available upon request under a free license, and the participation of other institutions in further development is welcome.Key Points• A platform for structured reporting using IHE MRRT-compliant templates is presented. • Incorporating structured reporting into clinical routine is feasible. • Full source code will be provided upon request under a free license.

Impact of combined FDG-PET/CT and MRI on the detection of local recurrence and nodal metastases in thyroid cancer

BackgroundSuspected recurrence of thyroid carcinoma is a diagnostic challenge when findings of both a radio iodine whole body scan and ultrasound are negative. PET/CT and MRI have shown to be feasible for detection of recurrent disease. However, the added value of a consensus reading by the radiologist and the nuclear medicine physician, which has been deemed to be helpful in clinical routines, has not been investigated. This study aimed to investigate the impact of combined FDG-PET/ldCT and MRI on detection of locally recurrent TC and nodal metastases in high-risk patients with special focus on the value of the multidisciplinary consensus reading.Materials and methodsForty-six patients with suspected locally recurrent thyroid cancer or nodal metastases after thyroidectomy and radio-iodine therapy were retrospectively selected for analysis. Inclusion criteria comprised elevated thyroglobulin blood levels, a negative ultrasound, negative iodine whole body scan, as well as combined FDG-PET/ldCT and MRI examinations.Neck compartments in FDG-PET/ldCT and MRI examinations were independently analyzed by two blinded observers for local recurrence and nodal metastases of thyroid cancer. Consecutively, the scans were read in consensus. To explore a possible synergistic effect, FDG-PET/ldCT and MRI results were combined. Histopathology or long-term follow-up served as a gold standard.For method comparison, sensitivity, specificity, positive and negative predictive values, and diagnostic accuracy were calculated.ResultsFDG-PET/ldCT was substantially more sensitive and more specific than MRI in detection of both local recurrence and nodal metastases. Inter-observer agreement was substantial both for local recurrence (κ = 0.71) and nodal metastasis (κ = 0.63) detection in FDG-PET/ldCT. For MRI, inter-observer agreement was substantial for local recurrence (κ = 0.69) and moderate for nodal metastasis (κ = 0.55) detection. In contrast, FDG-PET/ldCT and MRI showed only slight agreement (κ = 0.21). However, both imaging modalities identified different true positive results. Thus, the combination created a synergistic effect. The multidisciplinary consensus reading further increased sensitivity, specificity, and diagnostic accuracy.ConclusionsFDG-PET/ldCT and MRI are complementary imaging modalities and should be combined to improve detection of local recurrence and nodal metastases of thyroid cancer in high-risk patients. The multidisciplinary consensus reading is a key element in the diagnostic approach.

Fluoroscopy-guided Hepaticoneojejunostomy in Recurrent Anastomotic Stricture after Repeated Surgical Hepaticojejunostomy

follow-up examination, an angiogram showed patency of the SMA trunk and the distal ileal and ileocolic branches. However, local mild intimal hyperplasia in the stents was noticed. Although there was no significant stenosis that needed to be managed at the time, the intimal hyperplasia should be followed. In conclusion, during endovascular treatment of isolated dissection of the SMA, the transmesenteric retrograde approach can be an alternative choice when the conventional antegrade approach fails.

Transanal minimally invasive surgery (TAMIS) approach for large juxta-anal gastrointestinal stromal tumour

Gastrointestinal stromal tumours (GISTs) are rarely found in the rectum. Large rectal GISTs in the narrow pelvis sometimes require extended abdominal surgery to obtain free resection margins, and it is a challenge to preserve sufficient anal sphincter and urogenital function. Here we present a 56-year-old male with a locally advanced juxta-anal non-metastatic GIST of approximately 10 cm in diameter. Therapy with imatinib reduced the tumour size and allowed partial intersphincteric resection (pISR). The patient underwent an electrophysiology-controlled nerve-sparing hybrid of laparoscopic and transanal minimally invasive surgery (TAMIS) in a multimodal setting. The down-to-up approach provided sufficient dissection plane visualisation and allowed the confirmed nerve-sparing. Lateroterminal coloanal anastomosis was performed. Follow-up showed preserved urogenital function and good anorectal function, and the patient remains disease-free under adjuvant chemotherapy as of 12 months after surgery. This report suggests that the TAMIS approach enables extraluminal high-quality oncological and function-preserving excision of high-risk GISTs.

A proof of concept for epidemiological research using structured reporting with pulmonary embolism as a use case

OBJECTIVE This paper studies the possibilities of an integrated IT-based workflow for epidemiological research in pulmonary embolism (PE) using freely available tools and structured reporting (SR). METHODS We included a total of 521 consecutive cases which had been referred to the radiology department for CT pulmonary angiography with suspected PE. Free-text reports were transformed into structured reports using a freely available IHE Management of Radiology Report Templates-compliant reporting platform. D-dimer values were retrieved from the hospitals laboratory results system. All information was stored in the platforms database and visualized using freely available tools. For further analysis, we directly accessed the platforms database with an advanced analytics tool (RapidMiner). RESULTS Results: We were able to develop an integrated workflow for epidemiological statistics from reports obtained in clinical routine. The report data allowed for automated calculation of epidemiological parameters. Prevalence of PE was 27.6%. The mean age in patients with and without PE did not differ (62.8 years and 62.0 years, respectively, p = 0.987). As expected, there was a significant difference in mean D-dimer values (10.13 and 3.12 mg l-1 fibrinogen equivalent units, respectively, p < 0.001). CONCLUSION SR can make data obtained from clinical routine more accessible. Designing practical workflows is feasible using freely available tools and allows for the calculation of epidemiological statistics on a near realtime basis. Therefore, radiologists should push for the implementation of SR in clinical routine. Summary sentence: Implementing practical workflows that allow for the calculation of epidemiological statistics using SR and freely available tools is easily feasible. Advances in knowledge: Theoretical benefits of SR have long been discussed, but practical implementation demonstrating those benefits has been lacking. Here, we present a first experience providing proof that SR will make data from clinical routine more accessible.

Structured Reporting in Clinical Routine

BACKGROUND  The radiology report is the key component in the communication between radiologists and referring clinicians. Traditionally, reports are written as free text. Several studies have shown that structured reporting using dedicated report templates has a number of advantages compared to conventional reports. Therefore, many radiological societies have recommended the implementation of structured reporting in clinical routine. METHOD  In the meantime, collections of freely available templates have been presented and software solutions for structured reporting have been made commercially available. These allow for quality improvements in the written radiology report as they ensure that all relevant clinical information is included. Most vendors mainly supply proprietary report templates or allow users to create templates for their own institution. The German Radiological Society (DRG) has the goal of developing consensus-based, quality-assured report templates and providing them under a free license. RESULTS  The DRG has developed its first consensus-based report templates and provides them at www.befundung.drg.de. Further report templates will be developed in close cooperation with the respective committees of the DRG and referring clinicians. CONCLUSION  Structured reporting allows for a significant improvement in the quality of written radiology reports. The use of report templates requires personal and technical changes to the reporting process itself. Radiology should face these challenges in its leading role in the application of modern IT-based solutions. Vendors are now encouraged to provide practical solutions. KEY POINTS   · Structured reports have numerous advantages over conventional narrative reports.. · The German Radiological Society is developing consensus-based and quality assured report templates.. · Report templates are provided at www.befundung.drg.de under a free license.. · Vendors are now encouraged to provide solutions for the implementation of structured reporting.. CITATION FORMAT · Pinto dos Santos D, Hempel J, Mildenberger P et al. Structured Reporting in Clinical Routine. Fortschr Röntgenstr 2019; 191: 33 - 39.

Extent of portal vein tumor thrombosis in patients with hepatocellular carcinoma: The more, the worse?

Portal vein tumour thrombosis (PVTT) has a significant impact on the prognosis of patients with hepatocellular carcinoma (HCC). The degree of PVTT varies from sub‐/segmental invasion to complete occlusion of the main trunk. Aim of this study was to evaluate whether the degree of PVTT correlates with prognosis.

Comparison of medical-grade and calibrated consumer-grade displays for diagnosis of subtle bone fissures

ObjectiveTo compare the diagnostic accuracy of medical-grade and calibrated consumer-grade digital displays for the detection of subtle bone fissures.MethodsThree experienced radiologists assessed 96 digital radiographs, 40 without and 56 with subtle bone fissures, for the presence or absence of fissures in various bones using one consumer-grade and two medical-grade displays calibrated according to the DICOM-Grayscale Standard Display Function. The reference standard was consensus reading. Subjective image quality was also assessed by the three readers. Statistical analysis was performed using receiver operating characteristic analysis and by calculating the sensitivity, specificity, and Youden’s J for each combination of reader and display. Cohen’s unweighted kappa was calculated to assess inter-rater agreement. Subjective image quality was compared using the Wilcoxon signed-rank test.ResultsNo significant differences were found for the assessment of subjective image quality. Diagnostic performance was similar across all readers and displays, with Youden’s J ranging from 0.443 to 0.661. The differences were influenced more by the reader than by the display used for the assessment.ConclusionNo significant differences were found between medical-grade and calibrated consumer-grade displays with regard to their diagnostic performance in assessing subtle bone fissures. Calibrated consumer-grade displays may be sufficient for most radiological examinations.Key points• Diagnostic performance of calibrated consumer-grade displays is comparable to medical-grade displays.• There is no significant difference with regard to subjective image quality.• Use of calibrated consumer-grade displays could cut display costs by 60-80%.