Distribution of pressure on the breast in mammography using flexible and rigid compression plates: implications on patient handling

2020 ◽  
pp. 028418512097692
Author(s):  
Magnus Dustler ◽  
Daniel Förnvik ◽  
Pontus Timberg ◽  
Sophia Zackrisson ◽  
Serge Muller
Keyword(s):  
Mammography Screening ◽  
Pressure Sensors ◽  
Applied Force ◽  
Flexible Plate ◽  
Thoracic Region ◽  
Patient Handling ◽  
Breast Compression ◽  
Compression Plate ◽  
Perceived Pain ◽  
Breast Thickness

Background Breast compression in mammography is important but is a source of discomfort and has been linked to screening non-attendance. Reducing compression has little effect on breast thickness, and likely little effect on image quality, due to force being absorbed in the stiff juxta thoracic area instead of in the central breast. Purpose To investigate whether a flexible compression plate can redistribute force to the central breast and whether this affects perceived pain. Material and Methods Twenty-eight women recalled from mammography screening were compressed with flexible and rigid plates while retaining force and positioning, 15 in the craniocaudal (CC) view and 13 in the mediolateral oblique (MLO) view. Pressure distribution was continuously measured using pressure sensors. Results The flexible plate showed greater mean breast pressure in both views: 2.8 versus 2.3 kPa for CC (confidence interval [CI] = 0.2–0.8) and 1.0 versus 0.5 kPa for MLO (CI = 0.2–0.6). The percentage of applied force distributed to the breast was significantly higher with the flexible plate, both on CC (36% vs. 22%, CI = 1–11) and MLO (30% vs. 14%, CI = 4–13). Conclusion The flexible plate redistributes pressure to the central breast, achieving a better compression, particularly in the MLO view, though much applied force is still applied to the juxta thoracic region.

scholarly journals Intra- and inter-rater reliability of compressed breast thickness, applied force, and pressure distribution in screening mammography

2021 ◽  
Vol 10 (12) ◽  
pp. 205846012110620
Author(s):  
Martina Voigt ◽  
Anetta Bolejko ◽  
Magnus Dustler
Keyword(s):  
Pressure Distribution ◽  
Contact Area ◽  
Center Of Mass ◽  
Intraclass Correlation ◽  
Screening Mammography ◽  
Applied Force ◽  
Rater Reliability ◽  
Time Points ◽  
Breast Compression ◽  
Breast Thickness

Background Ensuring equivalent and reproducible breast compression between mammographic screening rounds is important for the diagnostic performance of mammography, yet the extent to which screening mammography positioning and compression is reproducible for the individual woman is unknown. Purpose To investigate the intra- and inter-rater reliability of breast compression in screening mammography. Materials and Methods Eleven breast-healthy women participated in the study. Two experienced radiographers independently positioned and compressed the breasts of each participant in two projections—right craniocaudal and left mediolateral oblique—and at two time points. The spatial pressure distribution on the compressed breast was measured using a pressure sensor matrix. Applied force, compressed breast thickness, force in field of view, contact area, mean pressure, and center of mass (anterio-posterior and mediolateral axes) were measured. The reliabilities of the measures between the time points for each radiographer (intra-rater reliability) and between the radiographers (inter-rater reliability) were analyzed using the intraclass correlation coefficient (ICC). Results Intra- and inter-rater reliabilities from both projections demonstrated good to excellent ICCs (≥0.82) for compressed breast thickness, contact area, and anterio-posterior center of mass. The other measures produced ICCs that varied from poor (≤0.42) to excellent (≥0.93) between time points and between radiographers. Conclusion Intra- and inter-rater reliability of breast compression was consistently high for compressed breast thickness, contact area, and anterio-posterior center of mass but low for mediolateral center of mass and applied force. Further research is needed to establish objective and clinically useful parameters for the standardization of breast compression.

scholarly journals PB.10: Breast compression, compressed breast thickness and volumetric breast density

2013 ◽  
Vol 15 (S1) ◽  
Author(s):  
J Khan-Perez ◽  
C Mercer ◽  
M Bydder ◽  
J Sergeant ◽  
J Morris ◽  
...  
Keyword(s):  
Breast Density ◽  
Breast Compression ◽  
Breast Thickness

Effect of Compression Force and Target or Target/Filter Combination on Mean Glandular Dose for Japanese Women in Full-Field Digital Mammography System

2021 ◽  
Vol 11 (10) ◽  
pp. 2695-2700
Author(s):  
Mie Ishii ◽  
Mai Nakamura ◽  
Rie Ishii ◽  
Keiichi Shida ◽  
Toshikazu Hatada ◽  
...  
Keyword(s):  
Digital Mammography ◽  
Japanese Women ◽  
Compression Pressure ◽  
Full Field ◽  
Breast Compression ◽  
Mean Glandular Dose ◽  
Full Field Digital Mammography ◽  
The Mean ◽  
The Difference ◽  
Breast Thickness

We constructed a mammography database of 807 Japanese women and 2,772 images obtained using five commercial full-field digital mammography (FFDM) devices at four different facilities. Five types of mammography devices fabricated by four manufacturers were used: one with a Mo target (AMULET F), one with Mo and Rh targets (Senographe DS), one with Mo and W targets (AMULET), and two with a W target (MAMMOMAT Fusion and Selenia Dimensions). The purpose of this study was to focus on the mean glandular dose (MGD) in the database and analyze the difference in the MGD of Japanese women radiographed by mammographic devices with different targets or target/filter combinations. Furthermore, we clarify the difference between the displayed and measured MGDs for the three types of mammography devices. The average compression pressure and compression breast thickness of the Japanese women in the mammography in this study were 90.9±21.7 N and 43.3±12.9 mm, respectively. The breast compression pressure slightly varied depending on the facility or FFDM device, while the compression breast thickness decreased with the increase in the compression pressure for all FFDM devices. Differences in breast compression thickness existed depending on the mammography devices. The MGDs of the two types of mammography devices using the W target were smallest (1.335±0.358, 1.218±0.464 mGy). The displayed and measured MGDs of the three types of FFDM devices had a good correlation. However, the difference between the displayed and measured MGDs of the two devices increased with the MGD.

User Identification Based on Force-Sensing Keypad by Force-Space-Time Method

2011 ◽  
Vol 255-260 ◽  
pp. 2023-2027
Author(s):  
Liang Tang ◽  
Chang Qi Yang ◽  
Zhi Wen Wu
Keyword(s):  
Pressure Sensors ◽  
Dynamic Measurement ◽  
Space Time ◽  
Applied Force ◽  
Force Sensing ◽  
Experimental Setup ◽  
User Identification ◽  
Key Press ◽  
The Individual

In this research, a force-sensing keypad was constructed by adding the pressure sensors with the individual keys on the standard keypad. The sensors permit the dynamic measurement of applied force and key-press timings. It can provide an advantage of more detailed information about key-press force. Details of the experimental setup used are given, and the results from initial tests are reported. The results shows the force-space-time method for user identification based on force-sensing keypad is valid.

scholarly journals Pressure-based Compression Guidance of the Breast in Digital Breast Tomosynthesis Using Flexible Paddles Compared to Conventional Compression

2020 ◽  
Vol 2 (6) ◽  
pp. 541-551
Author(s):  
Monique G J T B van Lier ◽  
Jerry E de Groot ◽  
Serge Muller ◽  
Gerard J den Heeten ◽  
Kathy J Schilling
Keyword(s):  
Digital Breast Tomosynthesis ◽  
Control Device ◽  
Institutional Review Board ◽  
Target Range ◽  
Compression Pressure ◽  
Breast Tomosynthesis ◽  
Breast Compression ◽  
Institutional Review Board Approval ◽  
Institutional Review ◽  
Breast Thickness

Abstract Objective We investigated the effect of introducing a pressure-based flexible paddle on compression parameters and user and patient experience of digital breast tomosynthesis (DBT) combined with patient-assisted compression or technologist compression. Methods After institutional review board approval, women with a DBT appointment who gave informed consent received pressure-based flexible paddle breast compression. Eight lights on the paddle were illuminated (1.9 kPa per light) as pressure was applied, aiming for an 8–13.9 kPa target range. The compression level was applied by the technologist or the participant utilizing a remote control device. The participant’s and technologist’s experiences were assessed by a questionnaire. Compression parameters were compared to previous examinations. Comparative statistics were performed using t-tests. Results Pressure-based compression (PBC) was judged to be similar or more comfortable compared with previous traditional exams (80%, 83/103), and 87% (90/103) of participants would recommend PBC to friends. Pressure variability decreased for craniocaudal (CC) views (-55%, P < 0.001) and mediolateral oblique (MLO) views (-34%, P < 0.0001). Subgroup analysis showed a similar glandular dose for CC views, while breast thickness was reduced (-3.74 mm, P < 0.0001). For MLO views, both glandular dose (-0.13 mGy, P < 0.0001) and breast thickness were reduced (-6.70 mm, P < 0.0001). Mean compression parameters were similar for technologist compression and patient-assisted examinations. Conclusion Use of the pressure-based flexible paddle in DBT, with or without patient-assisted compression, improved participant and technologist experience and reduced compression pressure variability, mean breast thickness, and glandular dose.

scholarly journals Influence of breast compression pressure on the performance of population-based mammography screening

2017 ◽  
Vol 19 (1) ◽  
Author(s):  
Katharina Holland ◽  
Ioannis Sechopoulos ◽  
Ritse M. Mann ◽  
Gerard J. den Heeten ◽  
Carla H. van Gils ◽  
...  
Keyword(s):  
Mammography Screening ◽  
Population Based ◽  
Compression Pressure ◽  
Breast Compression

Breast compression parameters among women screened with standard digital mammography and digital breast tomosynthesis in a randomized controlled trial

2019 ◽  
Vol 61 (3) ◽  
pp. 321-330 ◽  
Author(s):  
Gunvor Gipling Waade ◽  
Åsne Holen ◽  
Sofie Sebuødegård ◽  
Hildegunn Aase ◽  
Kristin Pedersen ◽  
...  
Keyword(s):  
Digital Mammography ◽  
Controlled Trial ◽  
Digital Breast Tomosynthesis ◽  
Compression Pressure ◽  
Breast Tomosynthesis ◽  
Breast Compression ◽  
Randomized Controlled ◽  
Mean Glandular Dose ◽  
Evidence Based Guidelines ◽  
Breast Thickness

Background No evidence-based guidelines regarding optimal breast compression in mammography exist, neither for standard digital mammography nor for digital breast tomosynthesis. Purpose To compare breast compression parameters and mean glandular dose in a randomized controlled trial with digital mammography versus digital breast tomosynthesis. Material and Methods We used information from 21,729 women aged 50–69 years, who participated in the To-Be trial, as part of BreastScreen Norway, 2016–2017. Information was obtained from the DICOM header and by assessing the images in an automated software for density estimation (VolparaDensity). Using linear regression, we investigated the effect of screening technique on breast compression parameters; compression force (N), compression pressure (kPa), and compressed breast thickness (mm), and mean glandular dose (mGy), by view (craniocaudal [CC] and mediolateral oblique [MLO]). We adjusted for age, breast volume and fibroglandular volume. Results A total of 11,056 (50.9%) women were screened with digital mammography and 10,673 (49.1%) with digital breast tomosynthesis. Adjusted regression analysis showed that women undergoing digital mammography received higher compression forces than women undergoing digital breast tomosynthesis (CC: –4.7 N; MLO: –1.1 N, P < 0.001 for both), higher compression pressure (CC: –1.0 k Pa; MLO: –0.1 kPa, P < 0.001 for both), and higher values of compressed breast thickness in the MLO view (–0.3 mm, P = 0.02). The women undergoing digital mammography received a lower mean glandular dose than women undergoing digital breast tomosynthesis ([+]0.06 mGy, P < 0.001). Conclusion Women undergoing digital breast tomosynthesis received lower compression force, compression pressure, and compressed breast thickness in MLO view, compared to women undergoing digital mammography. Further studies should investigate the impact of breast compression on image quality, screening outcome, and radiation dose for digital mammography and digital breast tomosynthesis in order to establish evidence-based guidelines for breast compression.

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