亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Spatial resolution improvement and dose reduction potential for inner ear CT imaging using a z‐axis deconvolution technique

反褶积 图像分辨率 医学影像学 还原(数学) 内耳 光学 分辨率(逻辑) 核医学 物理 计算机科学 医学 数学 放射科 人工智能 几何学
作者
Cynthia H. McCollough,Shuai Leng,Johan Sunnegårdh,Thomas J. Vrieze,Lifeng Yu,John I. Lane,Rainer Raupach,Karl Stierstorfer,Thomas Flohr
出处
期刊:Medical Physics [Wiley]
卷期号:40 (6Part1) 被引量:34
标识
DOI:10.1118/1.4802730
摘要

Purpose: To assess the z‐axis resolution improvement and dose reduction potential achieved using a z‐axis deconvolution technique with iterative reconstruction (IR) relative to filtered backprojection (FBP) images created with the use of a z‐axis comb filter. Methods: Each of three phantoms were scanned with two different acquisition modes: (1) an ultrahigh resolution (UHR) scan mode that uses a comb filter in the fan angle direction to increase in‐plane spatial resolution and (2) a z‐axis ultrahigh spatial resolution (zUHR) scan mode that uses comb filters in both the fan and cone angle directions to improve both in‐plane and z‐axis spatial resolution. All other scanning parameters were identical. First, the ACR CT Accreditation phantom, rotated by 90° so that the high‐contrast spatial resolution targets were parallel to the coronal plane, was scanned to assess limiting spatial resolution and image noise. Second, section sensitivity profiles (SSPs) were measured using a copper foil embedded in an acrylic cylinder and the full‐width‐at‐half‐maximum (FWHM) and full‐width‐at‐tenth‐maximum (FWTM) of the SSPs were calculated. Third, an anthropomorphic head phantom containing a human skull was scanned to assess clinical acceptability for imaging of the temporal bone. For each scan, FBP images were reconstructed for the zUHR scan using the narrowest image thickness available. For the CT accreditation phantom, zUHR images were also reconstructed using an IR algorithm (SAFIRE, Siemens Healthcare, Forchheim, Germany) to assess the influence of the IR algorithm on image noise. A z‐axis deconvolution technique combined with the IR algorithm was used to reconstruct images at the narrowest image thickness possible from the UHR scan data. Images of the ACR and head phantoms were reformatted into the coronal plane. The head phantom images were evaluated by a neuroradiologist to assess acceptability for use in patients undergoing clinically indicated CT imaging of the temporal bone. Results: The limiting spatial resolution was 12 lp/cm for the FBP‐zUHR images and the IR‐UHR images, although visual assessment indicated a slight improvement for the IR‐UHR images. Image noise was 213.0, 181.8, and 153.5 for the FBP‐zUHR, IR‐zUHR, and IR‐UHR images, respectively. While the FWHM was essentially the same for the FBP‐zUHR and IR‐UHR images, the FWTM of the IR‐UHR images was almost 50% smaller compared to the FBP‐zUHR images (0.83 vs 1.25 mm, respectively). Images of the anthropomorphic head phantom were judged to be of higher quality for the IR‐UHR images compared to the FBP‐zUHR images. Conclusions: With use of a z‐axis deconvolution technique, z‐axis spatial resolution was improved for scans acquired using a comb filter only in the fan angle direction relative to FBP images acquired with a comb filter in both the fan and cone angle directions. By avoiding use of the comb filter in the cone angle direction and use of an IR algorithm, image noise was substantially reduced for the same scanner output (CTDIvol). Thus, overall image quality (spatial resolution and image noise) can be maintained relative to the FBP‐zUHR technique at a lower radiation dose.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
HXY完成签到,获得积分10
刚刚
1秒前
1秒前
4秒前
领导范儿应助linkman采纳,获得30
6秒前
eric888应助guozao采纳,获得150
7秒前
7秒前
小马甲应助科研通管家采纳,获得10
7秒前
towerman完成签到,获得积分10
7秒前
towerman发布了新的文献求助10
10秒前
Bizibili完成签到,获得积分10
20秒前
英俊的铭应助linkman采纳,获得10
26秒前
26秒前
27秒前
努力的淼淼完成签到 ,获得积分10
34秒前
37秒前
千寻完成签到,获得积分10
38秒前
团团完成签到 ,获得积分10
49秒前
Jasper应助linkman采纳,获得10
51秒前
天天快乐应助linkman采纳,获得30
1分钟前
黙宇循光完成签到 ,获得积分10
1分钟前
追三完成签到 ,获得积分10
1分钟前
温暖笑容发布了新的文献求助10
1分钟前
1分钟前
温暖笑容完成签到,获得积分10
1分钟前
wackykao完成签到 ,获得积分10
1分钟前
汉堡包应助linkman采纳,获得30
1分钟前
1分钟前
1分钟前
CC完成签到,获得积分10
1分钟前
CC发布了新的文献求助10
1分钟前
hilton完成签到,获得积分10
1分钟前
xiaoya完成签到,获得积分20
1分钟前
善学以致用应助CC采纳,获得10
1分钟前
1分钟前
xiaojia0501完成签到,获得积分10
1分钟前
xiaojia0501发布了新的文献求助10
1分钟前
脑洞疼应助松松果采纳,获得10
1分钟前
健壮的花瓣完成签到 ,获得积分10
1分钟前
1分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3990012
求助须知:如何正确求助?哪些是违规求助? 3532049
关于积分的说明 11256153
捐赠科研通 3270925
什么是DOI,文献DOI怎么找? 1805123
邀请新用户注册赠送积分活动 882270
科研通“疑难数据库(出版商)”最低求助积分说明 809216