SPIE Medical Imaging最新文献_第3页

C-arm technique using distance driven method for nephrolithiasis and kidney stones detection c臂技术应用距离驱动法进行肾结石和肾结石的检测

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2217213

Nuhad A. Malalla, Pengfei Sun, Ying Chen, M. Lipkin, G. Preminger, Jun Qin

引用次数: 0

Estimating breast thickness for dual-energy subtraction in contrast-enhanced digital mammography using calibration phantoms 使用校准幻象估计对比度增强数字乳房x线照相术中双能量减影的乳房厚度

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2214748

K. Lau, Y. Kwon, M. Aziz, R. Acciavatti, Andrew D. A. Maidment

{"title":"Estimating breast thickness for dual-energy subtraction in contrast-enhanced digital mammography using calibration phantoms","authors":"K. Lau, Y. Kwon, M. Aziz, R. Acciavatti, Andrew D. A. Maidment","doi":"10.1117/12.2214748","DOIUrl":"https://doi.org/10.1117/12.2214748","url":null,"abstract":"Dual-energy contrast-enhanced digital mammography (DE CE-DM) uses an iodinated contrast agent to image the perfusion and vasculature of the breast. DE images are obtained by a weighted logarithmic subtraction of the high-energy (HE) and low-energy (LE) image pairs. We hypothesized that the optimal DE subtraction weighting factor is thickness-dependent, and developed a method for determining breast tissue composition and thickness in DE CE-DM. Phantoms were constructed using uniform blocks of 100% glandular-equivalent and 100% adipose-equivalent material. The thickness of the phantoms ranged from 3 to 8 cm, in 1 cm increments. For a given thickness, the glandular-adipose composition of the phantom was varied using different combinations of blocks. The logarithmic LE and logarithmic HE signal intensities were measured; they decrease linearly with increasing glandularity for a given thickness. The signals decrease with increasing phantom thickness and the x-ray signal decreases linearly with thickness for a given glandularity. As the thickness increases, the attenuation difference per additional glandular block decreases, indicating beam hardening. From the calibration mapping, we have demonstrated that we can predict percent glandular tissue and thickness when given two distinct signal intensities. Our results facilitate the subtraction of tissue at the boundaries of the breast, and aid in discriminating between contrast agent uptake in glandular tissue and subtraction artifacts.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"9783 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129854744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Design, optimization and evaluation of a “smart” pixel sensor array for low-dose digital radiography 用于低剂量数字放射照相的“智能”像素传感器阵列的设计、优化和评估

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2216780

Kai Wang, Xinghui Liu, H. Ou, Jun Chen

引用次数: 0

On the properties of artificial neural network filters for bone-suppressed digital radiography 骨抑制数字摄影中人工神经网络滤波器的特性研究

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2216739

E. Park, Junbeom Park, Dae-Hong Kim, H. Youn, H. Jeon, Jin Sung Kim, D. Kang, Ho Kyung Kim

引用次数: 1

Low-dose performance of a whole-body research photon-counting CT scanner 全身光子计数CT扫描仪的低剂量性能研究

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2217240

Z. Yu, S. Leng, S. Kappler, K. Hahn, Zhoubo Li, A. Halaweish, A. Henning, E. Ritman, C. McCollough

引用次数: 9

Ray tracing reconstruction investigation for C-arm tomosynthesis c臂断层合成的射线追踪重建研究

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2217199

Nuhad A. Malalla, Ying Chen

引用次数: 0

Evaluation of a projection-domain lung nodule insertion technique in thoracic CT 胸部CT投影域肺结节插入技术的评价

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2217009

Chi Ma, Baiyu Chen, C. W. Koo, E. Takahashi, J. Fletcher, C. McCollough, D. Levin, R. Kuzo, Lyndsay D. Viers, Stephanie A. Vincent Sheldon, S. Leng, Lifeng Yu

{"title":"Evaluation of a projection-domain lung nodule insertion technique in thoracic CT","authors":"Chi Ma, Baiyu Chen, C. W. Koo, E. Takahashi, J. Fletcher, C. McCollough, D. Levin, R. Kuzo, Lyndsay D. Viers, Stephanie A. Vincent Sheldon, S. Leng, Lifeng Yu","doi":"10.1117/12.2217009","DOIUrl":"https://doi.org/10.1117/12.2217009","url":null,"abstract":"Task-based assessment of computed tomography (CT) image quality requires a large number of cases with ground truth. Inserting lesions into existing cases to simulate positive cases is a promising alternative approach. The aim of this study was to evaluate a recently-developed raw-data based lesion insertion technique in thoracic CT. Lung lesions were segmented from patient CT images, forward projected, and reinserted into the same patient CT projection data. In total, 32 nodules of various attenuations were segmented from 21 CT cases. Two experienced radiologists and 2 residents blinded to the process independently evaluated these inserted nodules in two sub-studies. First, the 32 inserted and the 32 original nodules were presented in a randomized order and each received a rating score from 1 to 10 (1=absolutely artificial to 10=absolutely realistic). Second, the inserted and the corresponding original lesions were presented side-by-side to each reader, who identified the inserted lesion and provided a confidence score (1=no confidence to 5=completely certain). For the randomized evaluation, discrimination of real versus artificial nodules was poor with areas under the receiver operative characteristic curves being 0.69 (95% CI: 0.58-0.78), 0.57 (95% CI: 0.46-0.68), and 0.62 (95% CI: 0.54-0.69) for the 2 radiologists, 2 residents, and all 4 readers, respectively. For the side-by-side evaluation, although all 4 readers correctly identified inserted lesions in 103/128 pairs, the confidence score was moderate (2.6). Our projection-domain based lung nodule insertion technique provides a robust method to artificially generate clinical cases that prove to be difficult to differentiate from real cases.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117271260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Synthesized interstitial lung texture for use in anthropomorphic computational phantoms 合成肺间质纹理，用于拟人化计算模型

SPIE Medical Imaging Pub Date : 2016-04-04 DOI: 10.1117/12.2217135

M. Becchetti, J. Solomon, W. Segars, E. Samei

{"title":"Synthesized interstitial lung texture for use in anthropomorphic computational phantoms","authors":"M. Becchetti, J. Solomon, W. Segars, E. Samei","doi":"10.1117/12.2217135","DOIUrl":"https://doi.org/10.1117/12.2217135","url":null,"abstract":"A realistic model of the anatomical texture from the pulmonary interstitium was developed with the goal of extending the capability of anthropomorphic computational phantoms (e.g., XCAT, Duke University), allowing for more accurate image quality assessment. Contrast-enhanced, high dose, thorax images for a healthy patient from a clinical CT system (Discovery CT750HD, GE healthcare) with thin (0.625 mm) slices and filtered back- projection (FBP) were used to inform the model. The interstitium which gives rise to the texture was defined using 24 volumes of interest (VOIs). These VOIs were selected manually to avoid vasculature, bronchi, and bronchioles. A small scale Hessian-based line filter was applied to minimize the amount of partial-volumed supernumerary vessels and bronchioles within the VOIs. The texture in the VOIs was characterized using 8 Haralick and 13 gray-level run length features. A clustered lumpy background (CLB) model with added noise and blurring to match CT system was optimized to resemble the texture in the VOIs using a genetic algorithm with the Mahalanobis distance as a similarity metric between the texture features. The most similar CLB model was then used to generate the interstitial texture to fill the lung. The optimization improved the similarity by 45%. This will substantially enhance the capabilities of anthropomorphic computational phantoms, allowing for more realistic CT simulations.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123230110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Large-pitch steerable synthetic transmit aperture imaging (LPSSTA) 大螺距可操纵合成透射孔径成像

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2216908

Y. Li, Michael C. Kolios, Yuan Xu

{"title":"Large-pitch steerable synthetic transmit aperture imaging (LPSSTA)","authors":"Y. Li, Michael C. Kolios, Yuan Xu","doi":"10.1117/12.2216908","DOIUrl":"https://doi.org/10.1117/12.2216908","url":null,"abstract":"A linear ultrasound array system usually has a larger pitch and is less costly than a phased array system, but loses the ability to fully steer the ultrasound beam. In this paper, we propose a system whose hardware is similar to a large-pitch linear array system, but whose ability to steer the beam is similar to a phased array system. The motivation is to reduce the total number of measurement channels M (the product of the number of transmissions, nT, and the number of the receive channels in each transmission, nR), while maintaining reasonable image quality. We combined adjacent elements (with proper delays introduced) into groups that would be used in both the transmit and receive processes of synthetic transmit aperture imaging. After the M channels of RF data were acquired, a pseudo-inversion was applied to estimate the equivalent signal in traditional STA to reconstruct a STA image. Even with the similar M, different choices of nT and nR will produce different image quality. The images produced with M=N2/15 in the selected regions of interest (ROI) were demonstrated to be comparable with a full phased array, where N is the number of the array elements. The disadvantage of the proposed system is that its field of view in one delay-configuration is smaller than a standard full phased array. However, by adjusting the delay for each element within each group, the beam can be steered to cover the same field of view as the standard fully-filled phased array. The LPSSTA system might be useful for 3D ultrasound imaging.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116891516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A beamforming method for plane wave Doppler imaging of high flow velocities 高流速平面波多普勒成像的波束形成方法

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2217226

O. Mansour, T. Poepping, J. Lacefield

{"title":"A beamforming method for plane wave Doppler imaging of high flow velocities","authors":"O. Mansour, T. Poepping, J. Lacefield","doi":"10.1117/12.2217226","DOIUrl":"https://doi.org/10.1117/12.2217226","url":null,"abstract":"Plane wave imaging is desirable for its ability to achieve high frame rates, allowing the capture of fast dynamic events, and continuous Doppler data. In most implementations of plane-wave imaging, multiple low resolution image (LRI) frames from different plane wave tilt angles are compounded to form a single high resolution image (HRI) frame, thereby reducing the frame rate. Compounding is a low-pass mean filter that causes attenuation and aliasing to signals with high Doppler shifts. On the other hand, the lateral beam profile and hence the quality of the HRI frames is improved by increasing the number of compounded frames. Therefore, a tradeoff exists between the Doppler limits and beam profile. In this paper, we present a method that eliminates this tradeoff and produces high resolution images without the use of compounding. The method suppresses the off-focus (clutter) signal by spreading its spectrum, while keeping the spectrum of the in-focus signal intact. The spreading is achieved by using a random sequence of tilt angles, as opposed to a linear sweep. Experiments performed using a carotid vessel phantom with constant flow demonstrate that the spread-spectrum method more accurately measures the parabolic flow profile of the vessel and in particular outperforms conventional plane-wave Doppler at higher flow velocities. The spread-spectrum method is expected to be valuable for Doppler applications that require measurement of high velocities at high frame rates.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121370882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1