A simple method to retrospectively estimate patient dose‐area product for chest tomosynthesis examinations performed using VolumeRAD

Båth, Magnus; Söderman, Christina; Svalkvist, Angelica

doi:10.1118/1.4895002

Cited by 17 publications

(9 citation statements)

References 39 publications

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“…The radiography system used in the present study was a Definium 8000 with the VolumeRAD tomosynthesis option (GE Healthcare, Chalfont St Giles, UK), the system presently dominating scientific and clinical evaluations of chest tomosynthesis. 6,36 With this system, the default configuration for a chest tomosynthesis examination includes the acquisition of 60 projection images distributed evenly over an angular range of 30 • centered around the standard orthogonal posteroanterior (PA) direction (a projection image density of 2). The x-ray output is constant for all projection images and is determined by the resulting exposure of a scout view image.…”

Section: A Chest Tomosynthesis Systemmentioning

confidence: 99%

“…The thicknesses of the PMMA plates were 1.0 and 0.8 cm, respectively, for the anterior and posterior sides of the phantom. For a majority of patients in the clinical practice, the resulting tube load per tomosynthesis projection image is determined by the limitation of a minimum tube load of 0.25 mA s. 36 Ninety tomosynthesis coronal section image series of the phantom were included in the study. The image series represented nine different tomosynthesis configurations each acquired with ten different tube voltages.…”

Section: B Image Collectionmentioning

confidence: 99%

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Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

et al. 2015

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At the standard dose level of the VolumeRAD system, the potential benefits from increasing the dose per projection do not fully compensate for the negative effects resulting from a reduction in the number of projection images. Consequently, the default configuration consisting of 60 projection images acquired over 30° is a good alternative. The tube voltage used in tomosynthesis does not have a large impact on the image quality.

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Section: A Chest Tomosynthesis Systemmentioning

confidence: 99%

Section: B Image Collectionmentioning

confidence: 99%

Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

et al. 2015

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“…The median estimated body mass index-adjusted effective dose of 0.14 mSv (range, 0.09-0.30 mSv) for DTS was somewhat higher than previously reported, which was probably because of body composition (35); the median weight of this cohort was 82.5 kg (range, 39.8-130.3 kg). The adjustment of the conversion factor according to body composition, with the inverse relationship between body weight and the conversion factor (25)(26)(27), aimed to improve the accuracy of the individual dose estimate.…”

Section: Discussionmentioning

confidence: 99%

Detection and Characterization of Solid Pulmonary Nodules at Digital Chest Tomosynthesis: Data from a Cohort of the Pilot Swedish Cardiopulmonary Bioimage Study

Meltzer¹,

Vikgren²,

Bergman³

et al. 2018

Radiology

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Purpose To investigate the performance of digital tomosynthesis (DTS) for detection and characterization of incidental solid lung nodules. Materials and Methods This prospective study was based on a population study with 1111 randomly selected participants (age range, 50-64 years) who underwent a medical evaluation that included chest computed tomography (CT). Among these, 125 participants with incidental nodules 5 mm or larger were included in this study, which added DTS in conjunction with the follow-up CT and was performed between March 2012 and October 2014. DTS images were assessed by four thoracic radiologists blinded to the true number of nodules in two separate sessions according to the 5-mm (125 participants) and 6-mm (55 participants) cut-off for follow-up of incidental nodules. Pulmonary nodules were directly marked on the images by the readers and graded regarding confidence of presence and recommendation for follow-up. Statistical analyses included jackknife free-response receiver operating characteristic, receiver operating characteristic, and Cohen κ coefficient. Results Overall detection rate ranges of CT-proven nodules 5 mm or larger and 6 mm or larger were, respectively, 49%-58% and 48%-62%. Jackknife free-response receiver operating characteristics figure of merit for detection of CT-proven nodules 5 mm or larger and 6 mm or larger was 0.47 and 0.51, respectively, and area under the receiver operating characteristic curve regarding recommendation for follow-up was 0.62 and 0.65, respectively. Conclusion Routine use of DTS would result in lower detection rates and reduced number of small nodules recommended for follow-up. RSNA, 2018.

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“…Effective dose for DTS was estimated by multiplying the dose-area product (DAP) of the DTS examination by the conversion factor of 0.26 mSv Gy −1 cm −2 ( 25 ) . The DAP of the DTS examination is not stored with the images, but was obtained by applying a validated method developed by Båth et al ( 26 ) , where the DAP of the DTS examination is estimated from data stored in the digital imaging and communications in medicine (DICOM) header of the scout image. Effective dose for CT was estimated by multiplying the stored dose length product by the conversion factor of 0.017 mSv mGy −1 cm −1 , as recommended by European guidelines ( 27 ) .…”

Section: Methodsmentioning

confidence: 99%

Visibility of Structures of Relevance for Patients With Cystic Fibrosis in Chest Tomosynthesis: Influence of Anatomical Location and Observer Experience

Meltzer

Båth

Kheddache

et al. 2016

Radiat Prot Dosimetry

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The aims of this study were to assess the visibility of pulmonary structures in patients with cystic fibrosis (CF) in digital tomosynthesis (DTS) using computed tomography (CT) as reference and to investigate the dependency on anatomical location and observer experience. Anatomical structures in predefined regions of CT images from 21 patients were identified. Three observers with different levels of experience rated the visibility of the structures in DTS by performing a head-to-head comparison with visibility in CT. Visibility of the structures in DTS was reported as equal to CT in 34 %, inferior in 52 % and superior in 14 % of the ratings. Central and peripheral lateral structures received higher visibility ratings compared with peripheral structures anteriorly, posteriorly and surrounding the diaphragm (p ≤ 0.001). Reported visibility was significantly higher for the most experienced observer (p ≤ 0.01). The results indicate that minor pathology can be difficult to visualise with DTS depending on location and observer experience. Central and peripheral lateral structures are generally well depicted.

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A simple method to retrospectively estimate patient dose‐area product for chest tomosynthesis examinations performed using VolumeRAD

Cited by 17 publications

References 39 publications

Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

Detection and Characterization of Solid Pulmonary Nodules at Digital Chest Tomosynthesis: Data from a Cohort of the Pilot Swedish Cardiopulmonary Bioimage Study

Visibility of Structures of Relevance for Patients With Cystic Fibrosis in Chest Tomosynthesis: Influence of Anatomical Location and Observer Experience

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