Multisection CT Protocols: Sex- and Age-specific Conversion Factors Used to Determine Effective Dose from Dose-Length Product

Deak, Paul; Smal, Yulia; Kalender, Willi A.

doi:10.1148/radiol.10100047

Cited by 760 publications

(509 citation statements)

References 23 publications

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“…9 In contrast to all other scans, the CTDI vol in the patient protocol of the Sn100-kV scan is referenced to a 32-cm phantom. An additional conversion factor of 2.5 was applied to compensate for the different reference phantoms.…”

Section: Estimation Of Radiation Exposurementioning

confidence: 99%

Imaging the Parasinus Region with a Third-Generation Dual-Source CT and the Effect of Tin Filtration on Image Quality and Radiation Dose

Lell¹,

May²,

Brand³

et al. 2015

American Journal of Neuroradiology

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Section: Estimation Of Radiation Exposurementioning

confidence: 99%

Imaging the Parasinus Region with a Third-Generation Dual-Source CT and the Effect of Tin Filtration on Image Quality and Radiation Dose

Lell¹,

May²,

Brand³

et al. 2015

American Journal of Neuroradiology

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“…All of these secondary findings had been remedied by diagnostic measures prior to the review in all four cases. The dose length product of the representative sample was, on average, 172.8 mGy*cm (SD 38.0, median 166, range 128 -345); based on the conversion factor for thoracic CT (0.0145 mSV/mGy*cm) [23], an average effective dose of 2.9 is calculated.…”

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confidence: 99%

Age-Dependent D-dimer Cut-off to Avoid Unnecessary CT-Exams for Ruling-out Pulmonary Embolism

Altmann

Wrede

Peetz

et al. 2015

Fortschr Röntgenstr

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Purpose: To evaluate the effect of an age-dependent D-Dimer cut-off in patients who underwent a computed tomography pulmonary angiogram (CTPA) for suspected pulmonary embolism (PE) Material and Methods: Retrospective application of an age-dependent D-dimer cut-off (age/100 in patients aged over 50) in 530 consecutive patients, both in- and outpatients, aged over 18, who underwent CTPA for suspected PE according to the guidelines. Results: The application of an age-dependent D-dimer cut-off showed a now negative test-result in 17 of 530 patients (3.2?%). The proportion was 4.1?% (17 of 418) in patients aged over 50. None of these 17 cases was diagnosed with PE in CTPA, the false-negative rate was 0?%. The effect could be seen in outpatients (14 of 377 [3.7?%]) as well as in inpatients(3 of 153 [2.0?%]) with no statistically significant difference (p?>?0.05). Conclusion: The application of an age-dependent D-dimer cut-off as part of the guidline-based algorithm for suspected PE reduced the number of necessary CTPA in outpatients as well as in inpatients. Key points: ??The application of an age-dependent D-dimer cut-off reduces the number of CTPA as part of the diagnostic algorithm in patients suspected for PE No reduction in diagnostic safety was found ??The age adjustement performed equally in outpatients and inpatients Citation Format: ??Altmann MM, Wrede CE., Peetz D et?al. Age-Dependent D-dimer Cut-off to Avoid Unnecessary CT-Exams for Ruling-out Pulmonary Embolism. Fortschr R?ntgenstr 2015; 187: 795???800

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“…An effective dose of an average of 7.8 mSv in our cohort is only slightly lower than, for example, computer tomography of the abdomen and pelvis, which taking into account the DLP values specified by the Federal Office for Radiation Protection [13] and a conversion factor of approx. 0.015 according to Deak et al [14] is at about 10 mSv. Hirofuji et al [15] evaluated the dosage of fluoroscopic examinations of the lower GI tract.…”

Section: Discussionmentioning

confidence: 88%

Clinical Value of Contrast Enema Prior to Ileostomy Closure

Goetz

Silva

Moser

et al. 2017

Fortschr Röntgenstr

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ABSTR AC TPurpose To determine the value of routine contrast enema of loop ileostomy before elective ileostomy closure regarding the influence on the clinical decision-making. Materials and MethodsRetrospective analysis of contrast enemas at a tertiary care center between 2005 und 2011. Patients were divided into two groups: Group I with ileostomy reversal, group II without ileostomy closure. Patient-related parameters (underlying disease, operation method) and parameters based on the findings (stenosis, leakage of anastomosis, incontinence) were evaluated.Results Analyzing a total of 252 patients in 89 % (group I, n = 225) ileostomy closure was performed. In 15 % the radiologic report was the only diagnostic modality needed for therapy decision; in 36 % the contrast enema and one or more other diagnostic methods were decisive. In 36 % the radiological report of the contrast imaging was not relevant for decision at all. In 11 % (group II, n = 27) no ileostomy closure was performed. In this group in 11 % the radiological report of the contrast enema was the only decision factor for not performing the ileostomy reversal. In 26 % one or more examination was necessary. In 26 % the result of the contrast examination was not relevant. ConclusionThe radiologic contrast imaging of loop ileostomy solely plays a minor role in complex surgical decisionmaking before planned reversal, but is important as first imaging method in detecting complications and often leads to additional examinations. This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.Ergebnisse Von den 252 untersuchten Patienten erfolgte bei 89 % (Gruppe I, n = 225) eine Rückverlagerungsoperation. Die Durchleuchtungsuntersuchung war dabei in 15 % als alleinige diagnostische Maßnahme zur Indikationsstellung ausreichend; in 36 % waren für die Entscheidung zur Rückverlage-rung weitere Zusatzuntersuchungen notwendig. Bei 36 % war der radiologische Befund irrelevant für die Therapieentscheidung. Bei 11 % (Gruppe II, n = 27) erfolge keine Rückverlage-rung. Dabei war in 19 % der radiologische Befund allein ausschlaggebend für die Ablehnung der Rückverlagerung und in 26 % war mindestens eine weitere Untersuchung nötig. In 26 % waren ausschließlich andere Untersuchungen entscheidend.

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Multisection CT Protocols: Sex- and Age-specific Conversion Factors Used to Determine Effective Dose from Dose-Length Product

Abstract: Conversion factors from DLP to effective dose should be specified separately for both sexes and should reflect the new ICRP recommendations. For pediatric patients, new conversion factors specific for the spectrum used should be established.

Cited by 760 publications

References 23 publications

Imaging the Parasinus Region with a Third-Generation Dual-Source CT and the Effect of Tin Filtration on Image Quality and Radiation Dose

Imaging the Parasinus Region with a Third-Generation Dual-Source CT and the Effect of Tin Filtration on Image Quality and Radiation Dose

Age-Dependent D-dimer Cut-off to Avoid Unnecessary CT-Exams for Ruling-out Pulmonary Embolism

Clinical Value of Contrast Enema Prior to Ileostomy Closure

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