BACKGROUND & AIMS: Magnetic resonance has assumed a preeminent role in the imaging evaluation of the spine. Owing to its multiplanar capability and superior soft tissue contrast, magnetic resonance imaging is the procedure of choice for a host of spinal disorders including degenerative disc disease, tumor evaluation, trauma, and spinal deformities. It represents the most accurate means of distinguishing between recurrent disc herniation and epidural fibrosis, and it excels at the assessment of many postoperative abnormalities such as infection, adjacent segment disc degeneration, and arachnoiditis. Magnetic resonance imaging is also helpful in the evaluation of numerous diagnostic challenges that are less well resolved by other means. This includes the distinction between disc herniation and epidural hematoma, synovial cyst from nonspecific fibrous thickening of a facet capsule, and the evaluation of numerous other soft tissue abnormalities. Computed tomography, computed tomography myelography, and scintigraphy continue to be useful for numerous specific disorders and in those patients with metal hardware or contraindications to magnetic resonance scanning. Overall, however, magnetic resonance is the imaging procedure preferred for many spinal disorders. This article is the first installment of a 3-part series discussing the role of magnetic resonance imaging of spinal disorders. Section 1 will describe the varying imaging modalities available and their relative advantages and disadvantages. A consideration of magnetic resonance imaging techniques will follow, followed by a discussion of the imaging manifestations of early degenerative disc disease. Section 2 will be devoted to an in depth discussion of specific pathologic processes encountered in patients with degenerative disc disease. Section 3 will end the series with a consideration of postoperative imaging followed by a discussion of spinal deformities, trauma, and neoplasms.

背景与目标： 磁共振在脊柱的成像评估中发挥了重要作用。由于其多平面能力和出色的软组织对比度，磁共振成像是许多脊柱疾病（包括退行性椎间盘疾病，肿瘤评估，创伤和脊柱畸形）的一种选择程序。它代表了区分复发性椎间盘突出症和硬膜外纤维化的最准确方法，并且擅长评估许多术后异常，例如感染，邻近节段性椎间盘退变和蛛网膜炎。磁共振成像还有助于评估许多诊断挑战，而这些挑战很难通过其他方式解决。这包括区分椎间盘突出症和硬膜外血肿，小囊囊的非特异性纤维增厚引起的滑膜囊肿，以及许多其他软组织异常的评估。计算机体层摄影术，计算机体层摄影术脊髓造影和闪烁显像术继续对许多特定疾病以及那些具有金属硬件或磁共振扫描禁忌症的患者有用。但是，总的来说，磁共振是许多脊柱疾病首选的成像方法。本文是由3部分组成的系列文章的第一部分，该系列讨论了磁共振成像对脊柱疾病的作用。第1节将描述可用的各种成像方式及其相对优缺点。随后将考虑磁共振成像技术，然后讨论早期退行性椎间盘疾病的成像表现。第2节将专门讨论变性椎间盘疾病患者遇到的特定病理过程。第三部分将在结束本系列文章时考虑术后影像学，然后讨论脊柱畸形，创伤和肿瘤。

BACKGROUND & AIMS: OBJECTIVE:To investigate clinically relevant intra-individual and mean changes in health-related quality of life (HRQoL) with the Short Form-36 Health Survey (SF-36) need to acknowledge that SF-36 is trademarked ie: SF-36(R) following cardiac intervention for Australian and Danish patients. DESIGN:Prospective observational study in tertiary cardiac centres in Townsville, Queensland, Australia and Copenhagen, Denmark. Two hundred coronary artery bypass graft surgery (CABG) patients of two Townsville hospitals, and 47 CABG or percutaneous coronary intervention (PCI) patients of a Copenhagen hospital. The main outcome measures are eight SF-36 health subscales at baseline and six months post-intervention. RESULTS:Australian and Danish patients experienced similar HRQoL pre-intervention. By six months post-intervention, patients experienced a significant mean improvement in all subscales of the SF-36 survey (p < or = 0.05), although up to 27% of patients had a clinically significant decline in HRQoL from baseline. CONCLUSIONS:These results demonstrate that it is necessary to investigate intra-individual changes in HRQoL as well as group mean changes as they produce different conclusions. In addition, establishing clinically significant intra-individual change standards may assist researchers and clinicians in determining whether an individual may benefit from therapy or intervention.

背景与目标： 目的：要通过36型健康调查（SF-36）调查与健康相关的生活质量（HRQoL）的临床相关个人和平均变化，需要承认SF-36是商标，即：SF-36（ R）对澳大利亚和丹麦患者进行心脏干预后。
设计：在澳大利亚昆士兰州汤斯维尔和丹麦哥本哈根的三级心脏中心进行前瞻性观察研究。两家汤斯维尔医院的200例冠状动脉搭桥术（CABG）患者，以及哥本哈根医院的47例CABG或经皮冠状动脉介入治疗（PCI）患者。主要结果指标是基线时和干预后六个月的八个SF-36健康子量表。
结果：澳大利亚和丹麦患者经历了类似的HRQoL干预前。干预后六个月，患者在SF-36调查的所有子量表中均经历了显着的平均改善（p <或= 0.05），尽管高达27％的患者的HRQoL与基线相比有临床上的显着下降。
结论：这些结果表明，有必要研究HRQoL的个体内部变化以及群体均值变化，因为它们会产生不同的结论。此外，建立具有临床意义的个体内部变更标准可能有助于研究人员和临床医生确定个人是否可以从治疗或干预中受益。

BACKGROUND & AIMS: :The aim of this pilot study was to investigate anaesthetists' assessment of the ability of patients to increase cardiac output over a range of clinical scenarios and of their perceived 'likelihood of transfusion' in these scenarios. Specialist anaesthetists were given a questionnaire with clinical cues in the form of diagnoses about theoretical patients. They were asked to use 100 mm visual analogue scales (VAS) for their assessments of each patient's cardiac reserve and their 'likelihood of transfusion' of these patients; the endpoints of the VAS being 'Very low' (0 mm) to 'High' (100 mm), and 'Do not transfuse' (0 mm) to 'Transfuse' (100 mm) respectively. The assessment of patients' cardiac output reserve by anaesthetists (n = 54) showed great variation; for example, a patient with severe aortic stenosis was perceived overall to have a limited ability to increase cardiac output (mean VAS 16 mm) but there was considerable variation between anaesthetists (25-75 percentiles 10 mm to 21 mm). Assessment of 'likelihood of transfusion' (n = 42) also had great variation; as an example a patient with 'angina' with a haemoglobin of 95 g l(-1) was perceived overall to have an average likelihood of transfusion of 50 mm, but the 25-75 percentiles ranged from 33 mm to 71 mm. This study suggests that inter-anaesthetist variability in the assessment of a patient's 'cardiac output reserve' and his 'likelihood of transfusion' is large.

背景与目标： ：这项初步研究的目的是调查麻醉师对患者在一系列临床情况下增加心输出量的能力以及他们在这些情况下感知的“输血可能性”的评估。专家麻醉师接受了有关临床线索的问卷调查，形式是对理论患者的诊断。他们被要求使用100 mm视觉模拟量表（VAS）评估每个患者的心脏储备和这些患者的“输血可能性”。 VAS的端点分别为“非常低”（0毫米）至“高”（100毫米）和“请勿输液”（0毫米）至“输液”（100毫米）。麻醉师对患者心输出量储备的评估（n = 54）显示出很大的差异。例如，总的来说，严重的主动脉瓣狭窄患者的心输出量增加能力有限（平均VAS 16毫米），但是麻醉师之间的差异很大（10毫米至21毫米为25-75％）。对“输血可能性”的评估（n = 42）也有很大差异。例如，患有“心绞痛”且血红蛋白为95 g l（-1）的患者总体上被认为平均输血的可能性为50 mm，但25-75％的范围为33 mm至71 mm。这项研究表明，麻醉师之间在评估患者的“心输出量储备”和“输血可能性”方面存在很大差异。

BACKGROUND & AIMS: Nodular regenerative hyperplasia (NRH) of the liver is a condition characterized by multiple monoacinar regenerative nodules in the absence of fibrous septa. When these nodules become confluent they may be seen with sonography or CT. The appearance of these pseudotumoral pattern of NRH has been scarcely described with MRI. We present the imaging findings of five patients with NRH and a pseudotumoral form at sonography. Sonography depicted hyperechoic lesions in four patients and hypoechoic lesions in another. Computed tomography showed hypodense lesions with little contrast enhancement in two patients. Three patients showed subtle focal liver lesions on MRIisointense in one, mildly hypointense in another, and minimally hyperintense in a patient with siderosis. The dynamic behavior at MRI was similar to the normal liver parenchyma. Hyperechoic lesions on sonography or hypodense lesions on CT, barely or not seen on MRI, can be indicative of NRH in an appropriate clinical setting.

背景与目标： 肝脏的结节性再生增生（NRH）是一种疾病，其特征是在没有纤维间隔的情况下出现了多个单腺泡再生结节。当这些结节汇合时，可以通过超声检查或CT看到。 MRI几乎没有描述这些NRH假瘤型的出现。我们在超声检查中显示了5名NRH和假瘤形式的患者的影像学表现。超声检查显示四名患者出现高回声病变，另一名患者出现低回声病变。计算机断层扫描显示两名患者的低密度病变，对比增强很少。 3例患者在MRIisointense上显示出细微的局灶性肝损害，另一例患者表现为轻度低点，铁锈病患者显示为最低程度的高强度。 MRI的动态行为与正常肝实质相似。在适当的临床环境中，超声检查中的高回声病变或CT上的低密度病变（在MRI上几乎未见或未见）可指示NRH。

BACKGROUND & AIMS: :Isolated cleft mitral valve (ICMV) is a rare entity not known to be related to pulmonary atresia with ventricular septal defect (PA-VSD). This report describes the use of cardiovascular magnetic resonance (CMR) imaging to diagnose ICMV in a patient with repaired PA-VSD who presented with incidental severe mitral regurgitation (MR) on follow-up echocardiography. An associated pulmonary varix secondary to the severe MR also was shown by CMR.

背景与目标： ：孤立的二尖瓣裂开（ICMV）是一种罕见病，未知与室间隔缺损的肺动脉闭锁（PA-VSD）相关。本报告介绍了在后续超声心动图检查中出现偶发性严重二尖瓣关闭不全（MR）的PA-VSD修复患者中，使用心血管磁共振（CMR）成像诊断ICMV的情况。 CMR还显示了继发于严重MR的相关肺静脉曲张。

BACKGROUND & AIMS: :A new optical method is proposed to investigate the reflectance of structurally coloured objects, such as Morpho butterfly wing scales and cholesteric liquid crystals. Using a reflected-light microscope and a digital single-lens reflex (DSLR) camera, we have successfully measured the two-dimensional reflection pattern of individual wing scales of Morpho butterflies. We demonstrate that this method enables us to measure the bidirectional reflectance distribution function (BRDF). The scattering image observed in the back focal plane of the objective is projected onto the camera sensor by inserting a Bertrand lens in the optical path of the microscope. With monochromatic light illumination, we quantify the angle-dependent reflectance spectra from the wing scales of Morpho rhetenor by retrieving the raw signal from the digital camera sensor. We also demonstrate that the polarization-dependent reflection of individual wing scales is readily observed using this method, using the individual wing scales of Morpho cypris. In an effort to show the generality of the method, we used a chiral nematic fluid to illustrate the angle-dependent reflectance as seen by this method.

背景与目标： ：提出了一种新的光学方法来研究结构上有色物体的反射率，例如Morpho蝴蝶翼鳞和胆甾型液晶。使用反射光显微镜和数字单镜反光（DSLR）相机，我们已经成功地测量了Morpho蝴蝶单个机翼尺度的二维反射图案。我们证明了这种方法使我们能够测量双向反射率分布函数（BRDF）。在物镜的后焦平面上观察到的散射图像通过在显微镜的光路中插入一个Bertrand透镜而投射到相机传感器上。利用单色光照明，我们通过从数码相机传感器中检索原始信号，从Morpho rhetenor的机翼尺度上量化了与角度相关的反射光谱。我们还证明，使用这种方法，使用蓝蝶的单个机翼鳞片，很容易观察到单个机翼鳞片的偏振依赖性反射。为了说明该方法的一般性，我们使用手性向列液来说明该方法所见的角度依赖性反射率。

BACKGROUND & AIMS: BACKGROUND AND PURPOSE:Imaging of bisphosphonate-induced osteonecrosis of the jaw is essential for surgical planning. We compared the extent of BONJ on contrast-enhanced MR imaging, [(18)F] fluoride PET/CT, and panoramic views derived from standard conebeam CT with clinical pre- and intraoperative examinations. MATERIALS AND METHODS:Between February 2011 and January 2012, ten subjects with written informed consent (9 women; mean, 69.6 years; range, 53-88 years) were included in this prospective ethics-board-approved study. Patients underwent CEMR imaging, [(18)F] fluoride PET/CT, and CBCT and were clinically examined pre- and intraoperatively. Surgery was performed, and BONJ was histologically confirmed in 9 patients. Location and extent of BONJ on different modalities/examinations were graphically compared (0 = no pathologic finding, 1 = smallest, 5 = largest extent of BONJ). Rank tests were used to assess overall and paired differences of ratings in 9 patients. A P value <.05 was considered statistically significant. RESULTS:Significant differences in BONJ extent among different modalities and examinations were found (P < .001). The highest median rank was seen in PET/CT (4 ± 1.12) and CEMR imaging (4 ± 1.01), followed by intraoperative examinations (3 ± 0.71), CBCT (2 ± 0.33), and preoperative examinations (1 ± 0). No significant differences were found between PET/CT and CEMR imaging (P = .23), except when comparing PET/CT to either CBCT, pre- and intraoperative examinations (all P < .05). Preoperative examinations showed significantly less extensive disease than all other modalities/examinations (all P < .05). CONCLUSIONS:[(18)F] fluoride PET/CT and CEMR imaging revealed more extensive involvement of BONJ compared with panoramic views from CBCT and clinical examinations.

背景与目标： 背景与目的：双膦酸盐诱发的颌骨骨坏死的成像对于手术计划至关重要。我们将BONJ在对比增强MR成像，[（18）F]氟化物PET / CT和标准锥束CT的全景图与临床术前和术中检查之间进行了比较。
材料与方法：在2011年2月至2012年1月之间，该前瞻性伦理委员会批准的研究纳入了十名获得书面知情同意的受试者（9名女性；平均69.6岁；范围53-88岁）。患者接受了CEMR成像，[（18）F]氟化物PET / CT和CBCT，并在术前和术中接受了临床检查。进行了手术，并在组织学上证实了9例患者的BONJ。以图形方式比较了BONJ在不同模态/检查中的位置和程度（0 =无病理发现，1 =最小，5 =最大程度的BONJ）。等级检验用于评估9位患者的总体和配对等级差异。 P值<.05被认为具有统计学意义。
结果：在不同的方式和检查之间，BONJ范围存在显着差异（P <.001）。 PET / CT（4±1.12）和CEMR成像（4±1.01），手术中检查（3±0.71），CBCT（2±0.33）和术前检查（1±0）最高。除了将PET / CT与CBCT，术前和术中检查进行比较（所有P <.05）之外，PET / CT和CEMR成像之间没有发现显着差异（P = 0.23）。术前检查显示，与所有其他方式/检查相比，病灶明显更少（所有P <.05）。
结论：[（18）F]氟化物PET / CT和CEMR成像显示，与CBCT和临床检查的全景图相比，BONJ的介入程度更大。

BACKGROUND & AIMS: :In a prospective magnetic resonance imaging and cognitive study of 38 demented patients and 15 control subjects, 11 of 27 patients with Alzheimer's disease and 8 of 11 patients with vascular dementia had significant periventricular hyperintensities. Memory and language testing in the early investigation of dementia is useful to distinguish patients with or without periventricular hyperintensities on magnetic resonance imaging. Patients without periventricular hyperintensities are worse on memory and conceptualization tests than patients with periventricular hyperintensities, who tend to be worse on comprehension and attention tests. These differences in cognitive pattern are present between patients with different pathogenesis who are otherwise matched for dementia severity. Language and some nonverbal cognitive deficits correlate with the extent of cortical and ventricular atrophy in Alzheimer's disease.

背景与目标： ：在一项针对38名痴呆患者和15名对照受试者的前瞻性磁共振成像和认知研究中，27名阿尔茨海默氏病患者中的11名和11名血管性痴呆患者中的8名出现了明显的脑室高信号。痴呆症早期调查中的记忆和语言测试有助于区分磁共振成像中是否伴有脑室高信号的患者。没有脑室高信号的患者在记忆力和概念化测试方面比脑室高信号的患者在理解和注意力测试方面更差。这些认知模式上的差异存在于具有不同发病机理的患者之间，这些患者在其他方面与痴呆严重程度相匹配。语言和一些非语言认知缺陷与阿尔茨海默氏病的皮质和心室萎缩程度有关。

BACKGROUND & AIMS: BACKGROUND:Evidence-based guidelines recommend limited perioperative diagnostic imaging for new breast cancer diagnoses. For patients aged >65 years, conventional imaging use (mammography, plain radiographs, and ultrasound) has remained stable, whereas advanced imaging (computed tomography [CT], nuclear medicine scans [positron emission tomography/bone scans], and magnetic resonance imaging [MRI]) use has increased. In this study, the authors evaluated traditional and advanced imaging use among younger patients (aged ≤ 65 years) undergoing breast cancer surgery. METHODS:The MarketScan Commercial Claims and Encounters Research Database from 2005 through 2008 was analyzed to evaluate the use of conventional and advanced diagnostic imaging associated with surgery for ductal carcinoma in situ (DCIS) or stage I through III invasive breast cancer. RESULTS:The study cohort included 52,202 women (13% with DCIS and 87% with stage I-III breast cancer). The proportion of patients undergoing conventional imaging remained stable, whereas the average number of conventional imaging tests per patient increased from 4.21 tests in 2005 to 4.79 tests per patient in 2008 (P < .0001). For advanced imaging, the proportion of women who underwent imaging increased from 48.8% in 2005 to 68.8% in 2008 (P < .0001), as did the number of tests per patient (from 1.53 tests in 2005 to 1.98 tests in 2008; P < .0001). MRI examinations accounted for nearly all of the increase in advanced imaging. Patients who underwent MRI examinations received significantly more traditional imaging tests compared with to those who did not, indicating that these tests are additive and are not replacing traditional imaging. CONCLUSIONS:The current results demonstrate that the use of perioperative breast MRI has increased among women aged <65 years. Further study is indicated to determine whether the benefits of this procedure justify increased use.

背景与目标： 背景：基于证据的指南建议对新的乳腺癌进行有限的围手术期诊断成像。对于65岁以上的患者，传统的影像学检查（乳房X线照片，X线平片和超声检查）保持稳定，而高级影像学（计算机断层扫描[CT]，核医学扫描[正电子发射断层扫描/骨扫描]和磁共振成像[ MRI]）的使用有所增加。在这项研究中，作者评估了接受乳腺癌手术的年轻患者（≤65岁）的传统和高级成像使用情况。
方法：对2005年至2008年的MarketScan商业索赔和遭遇研究数据库进行了分析，以评估与导管原位癌（DCIS）或I至III期浸润性乳腺癌手术相关的常规和高级诊断成像的使用。
结果：该研究队列包括52,202名妇女（13％的DCIS患者和87％的I-III期乳腺癌患者）。接受常规影像学检查的患者比例保持稳定，而每名患者的常规影像学检查的平均次数从2005年的4.21次检查增加到2008年的4.79次检查（P <.0001）。对于高级影像学，接受影像学检查的女性比例从2005年的48.8％增加到2008年的68.8％（P <.0001），每位患者的检查次数也从2005年的1.53次增加到2008年的1.98次； P <.0001）。 MRI检查几乎占了高级影像学增长的全部。与未接受MRI检查的患者相比，接受过MRI检查的患者接受的传统成像检查要多得多，这表明这些检查是相加的，不能替代传统成像。
结论：目前的结果表明，<65岁的女性围手术期乳房MRI的使用有所增加。指示需要进一步研究以确定该程序的益处是否可以证明增加使用的合理性。

BACKGROUND & AIMS: :Bacterial populations exhibit a range of metabolic states influenced by their environment, intra- and interspecies interactions. The identification of bacterial metabolic states and transitions between them in their native environment promises to elucidate community behavior and stochastic processes, such as antibiotic resistance acquisition. In this work, we employ two-photon fluorescence lifetime imaging microscopy (FLIM) to create a metabolic fingerprint of individual bacteria and populations. FLIM of autofluorescent reduced nicotinamide adenine dinucleotide (phosphate), NAD(P)H, has been previously exploited for label-free metabolic imaging of mammalian cells. However, NAD(P)H FLIM has not been established as a metabolic proxy in bacteria. Applying the phasor approach, we create FLIM-phasor maps of Escherichia coli, Salmonella enterica serovar Typhimurium, Pseudomonas aeruginosa, Bacillus subtilis, and Staphylococcus epidermidis at the single cell and population levels. The bacterial phasor is sensitive to environmental conditions such as antibiotic exposure and growth phase, suggesting that observed shifts in the phasor are representative of metabolic changes within the cells. The FLIM-phasor approach represents a powerful, non-invasive imaging technique to study bacterial metabolism in situ and could provide unique insights into bacterial community behavior, pathology and antibiotic resistance with sub-cellular resolution.

背景与目标： ：细菌种群表现出一系列受其环境，种内和种间相互作用影响的代谢状态。细菌代谢状态及其在自然环境中之间的过渡的鉴定有望阐明社区行为和随机过程，例如获得抗生素抗药性。在这项工作中，我们采用双光子荧光寿命成像显微镜（FLIM）来创建单个细菌和种群的代谢指纹。自发荧光还原烟酰胺腺嘌呤二核苷酸（磷酸）的FLIM NAD（P）H先前已被用于哺乳动物细胞的无标记代谢成像。但是，NAD（P）H FLIM尚未被确定为细菌中的代谢替代物。应用相量方法，我们在单个细胞和种群水平上创建了大肠杆菌，肠炎沙门氏菌血清型鼠伤寒杆菌，铜绿假单胞菌，枯草芽孢杆菌和表皮葡萄球菌的FLIM相量图。细菌相量对环境条件敏感，例如抗生素暴露和生长期，这表明所观察到的相量变化代表细胞内代谢变化。 FLIM相量方法代表了一种强大的，非侵入性的成像技术，可用于原位研究细菌代谢，并且可以通过亚细胞分辨率为细菌群落行为，病理学和抗生素耐药性提供独特的见解。

BACKGROUND & AIMS: BACKGROUND:Central venous oxygen saturation (ScvO2) remains the gold standard surrogate for tissue oxygen extraction in paediatric cardiac surgery. Near-infrared spectroscopy (NIRS) has been developed as a non-invasive diagnostic tool for regional oxygen saturation. The aim was to compare regional oxygen saturation measured by NIRS with ScvO2 in postoperative paediatric cardiac patients. METHODS:In this prospective study, we included newborns and infants younger than 45 days undergoing heart surgery. We recorded continuous ScvO2 and NIRS regional saturation placed on the forehead (B) and right flank (S) for 48 h postoperatively. A Bland-Altman's analysis was used to assess the agreement between these measurements. RESULTS:A total of 23 patients were included with a median age of 12 days (2-46) and median weight of 3.1 kg (2.3-4.47). The mean difference (MD) ScvO2- B NIRS was 10.45% with limits of agreement (LOA) -17.23 to 38.13% and ScvO2- S NIRS MD 7.16% with LOA: -25.51 to 39.84%. The single ventricle ScvO2- S NIRS subgroup had MD within ± 5%; however, wide LOA was observed. The remaining subgroups showed MD nearly above ± 5%, with wide LOA. CONCLUSIONS:The regional oxygen saturation of brain and kidney did not match ScvO2 as estimation of global tissue perfusion. Nevertheless, NIRS may still provide information regarding regional circulation that may help in the management of neonatal cardiac surgery patients.

背景与目标： 背景：中央静脉血氧饱和度（ScvO2）仍然是小儿心脏外科手术中组织氧提取的金标准。近红外光谱法（NIRS）已被开发为一种用于区域血氧饱和度的非侵入性诊断工具。目的是比较由NIRS和ScvO2测得的小儿心脏术后患者的局部血氧饱和度。
方法：在这项前瞻性研究中，我们纳入了接受心脏手术的45天以下的新生儿和婴儿。我们记录了连续的ScvO2和NIRS区域饱和度放置在术后48 h的前额（B）和右胁（S）上。用布兰德-奥特曼（Bland-Altman）分析来评估这些测量之间的一致性。
结果：总共纳入23名患者，中位年龄为12天（2-46），中位体重为3.1 kg（2.3-4.47）。 ScvO2-B NIRS的平均差异（MD）为10.45％，协议限制（LOA）为-17.23至38.13％，Slovo2- S NIRS MD的7.16％LOA为-25.51至39.84％。单心室ScvO2-S NIRS亚组的MD≤±5％。但是，观察到广泛的LOA。其余亚组的MD值接近±5％，LOA较宽。
结论：脑和肾脏的局部血氧饱和度与ScvO2不符，无法估计整体组织灌注。尽管如此，NIRS仍可能提供有关区域循环的信息，这可能有助于新生儿心脏外科手术患者的管理。

BACKGROUND & AIMS: :Myocardial extracellular volume fraction (ECV) reflecting diffuse myocardial fibrosis can be measured with T1 mapping cardiovascular magnetic resonance (CMR) before and after the application of a gadolinium-based extracellular contrast agent. The equilibrium between blood and myocardium contrast concentration required for ECV measurements can be obtained with a primed contrast infusion (equilibrium contrast-CMR). We hypothesized that equilibrium can also be achieved with a single contrast bolus to accurately measure diffuse myocardial fibrosis in patients with congenital heart disease (CHD). Healthy controls (n = 17; median age 24.0 years) and patients with CHD (n = 19; 25.0 years) were prospectively enrolled. Using modified Look-Locker inversion recovery T1 mapping before, 15 min after bolus injection, and during constant infusion of gadolinium-DOTA, T1 values were obtained for blood pool and myocardium of the left ventricle (LV), the interventricular septum (IVS), and the right ventricle (RV) in a single midventricular plane in short axis or in transverse orientation. ECV of LV, IVS and RV by bolus-only and bolus-infusion correlated significantly in CHD patients (r = 0.94, 0.95, and 0.74; p < 0.01, respectively) and healthy controls (r = 0.96, 0.89, and 0.64; p < 0.05, respectively). Bland-Altman plots revealed no significant bias between the techniques for any of the analyzed regions. ECV of LV and RV myocardium measured by bolus-only T1 mapping agrees well with bolus-infusion measurements in patients with CHD. The use of a bolus-only approach facilitates the integration of ECV measurements into existing CMR imaging protocols, allowing for assessment of diffuse myocardial fibrosis in CHD in clinical routine.

背景与目标： ：应用基于g的细胞外造影剂前后，可通过T1映射心血管磁共振（CMR）来测量反映弥漫性心肌纤维化的心肌细胞外体积分数（ECV）。 ECV测量所需的血液和心肌造影剂浓度之间的平衡可通过灌注造影剂（平衡造影剂CMR）获得。我们假设通过单次对比推注也可以达到平衡，以准确测量先天性心脏病（CHD）患者的弥漫性心肌纤维化。前瞻性纳入健康对照组（n = 17）；中位年龄24.0岁； CHD患者（n = 19； 25.0岁）。使用改良的Look-Locker反转恢复T1映射，在推注大剂量，之后15分钟以及在持续输注--DOTA期间，获得了左心室（LV），心室间隔（IVS）的血池和心肌的T1值，右心室（RV）在短心轴或横向方向的单个心室中平面内。仅推注和推注输注的LV，IVS和RV的ECV在CHD患者（分别为r = 0.94、0.95和0.74； p <0.01）和健康对照者（r = 0.96、0.89和0.64； p中显着相关）分别<0.05）。布兰德-奥特曼（Bland-Altman）图显示，任何被分析区域的技术之间均无明显偏差。通过仅推注T1测绘测得的LV和RV心肌的ECV与CHD患者的推注量测量非常吻合。仅推注方法的使用有助于将ECV测量值集成到现有的CMR成像协议中，从而可以在临床常规中评估CHD中弥漫性心肌纤维化。

BACKGROUND & AIMS: :The solution of the forward problem in fluorescence molecular imaging strongly influences the successful convergence of the fluorophore reconstruction. The most common approach to meeting this problem has been to apply the diffusion approximation. However, this model is a first-order angular approximation of the radiative transfer equation, and thus is subject to some well-known limitations. This manuscript proposes a methodology that confronts these limitations by applying the radiative transfer equation in spatial regions in which the diffusion approximation gives decreased accuracy. The explicit integro differential equations that formulate this model were solved by applying the Galerkin finite element approximation. The required spatial discretization of the investigated domain was implemented through the Delaunay triangulation, while the azimuthal discretization scheme was used for the angular space. This model has been evaluated on two simulation geometries and the results were compared with results from an independent Monte Carlo method and the radiative transfer equation by calculating the absolute values of the relative errors between these models. The results show that the proposed forward solver can approximate the radiative transfer equation and the Monte Carlo method with better than 95% accuracy, while the accuracy of the diffusion approximation is approximately 10% lower.

背景与目标： ：荧光分子成像中前向问题的解决方案强烈影响荧光团重建的成功收敛。解决此问题的最常用方法是应用扩散近似。但是，该模型是辐射传递方程的一阶角近似，因此受到一些众所周知的限制。该手稿提出了一种通过在空间区域应用辐射传递方程来解决这些局限性的方法，其中扩散近似会降低精度。通过应用Galerkin有限元逼近法解决了表达该模型的显式积分微分方程。通过Delaunay三角剖分实现了所研究域的所需空间离散化，而方位角离散化方案则用于角空间。该模型已在两种模拟几何条件下进行了评估，并将结果与​​独立蒙特卡罗方法和辐射传递方程的结果进行了比较，方法是计算这些模型之间的相对误差的绝对值。结果表明，所提出的前向求解器可以近似于95％的精度近似辐射传递方程和蒙特卡罗方法，而扩散近似的精度则低约10％。

BACKGROUND & AIMS: OBJECTIVE:Echocardiography is used for the detection of cardiac sarcoid involvement in patients with non-cardiac sarcoidosis. Little information is available regarding temporal changes in left ventricular ejection fraction (LVEF) and left ventricular end-diastolic dimension (LVDd) in non-cardiac sarcoidosis patients. METHODS AND RESULTS:Fifty-four sarcoidosis patients who received periodic follow-up with echocardiography at our institute were enrolled in this study. At the time of initial ultrasonography, 13 patients were diagnosed with cardiac sarcoid involvement. All of the remaining 41 patients with extra-cardiac sarcoidosis only had a LVEF of >50%. During the median follow-up period of 39 months, two (4.9%) of the non-cardiac sarcoidosis patients were diagnosed with cardiac sarcoid involvement; one patient showed a progressive decline in the LVEF over a short period of time. It was also found that two of 41 non-cardiac sarcoidosis patients showed declines in the LVEF of >10% per year; however, they were not diagnosed with cardiac sarcoidosis during the follow-up period. CONCLUSION:Rapid deterioration of left ventricular function may increase the suspicion of sarcoid involvement of the heart in non-cardiac sarcoidosis patients; however, we must be aware that a certain subfraction of patients may not demonstrate significant abnormalities in LVEF or LVDd on periodic echocardiographic follow-up.

背景与目标： 目的：超声心动图用于检测非心脏结节病患者的心脏结节样病变。关于非心脏结节病患者左心室射血分数（LVEF）和左心室舒张末期尺寸（LVDd）随时间变化的信息很少。
方法与结果：54例结节病患者在我院接受了定期超声心动图随访。在初次超声检查时，有13例患者被诊断出患有心脏结节样病变。其余所有41例心外结节病患者的LVEF均仅> 50％。在39个月的中位随访期内，有2名（4.9％）非心脏结节病患者被诊断出患有心脏结节病。一名患者在短时间内LVEF逐渐下降。还发现41例非心脏结节病患者中有2例的LVEF下降每年> 10％。但是，在随访期间并未诊断出他们患有心脏结节病。
结论：非心脏结节病患者左心功能的迅速恶化可能增加对心脏结节累及的怀疑。但是，我们必须意识到，在定期超声心动图随访中，患者的某些亚分类可能未显示LVEF或LVDd的明显异常。

BACKGROUND & AIMS: :The imaging of breast cancer has undergone significant progression in recent years. A multimodality approach is often required, with ongoing developments in mammography, ultrasound, magnetic resonance and nuclear medicine all contributing to breast cancer imaging. Here we review the literature to assess how advances in well-established technologies, such as mammography, have brought added benefits both in terms of diagnostic and practical benefits, as well as allowing the application of derived technologies, such as tomosynthesis and contrast-enhanced mammography. We consider how these newer technologies may fit into clinical practice, both in terms of general population screening as well as use as problem solving tools in specific patient groups, and where the limitations for these may lie. We aim to highlight some of the promising advances in imaging that are still in earlier stages, such as magnetic resonance elastography, as well as reviewing techniques that are already becoming incorporated into clinical practice.

背景与目标： ：近年来，乳腺癌的影像学经历了重大进展。通常需要一种多模态方法，随着乳房X线照片，超声，磁共振和核医学的不断发展，所有这些都有助于乳腺癌的成像。在这里，我们回顾文献以评估诸如乳房X线照相术等成熟技术的进步如何在诊断和实际获益方面带来了额外的好处，以及如何允许诸如断层合成和对比增强的X线照相术等衍生技术的应用。我们从总体人群筛查以及在特定患者群体中用作问题解决工具的角度考虑这些更新技术如何适合临床实践，以及这些方法可能存在的局限性。我们的目标是突出显示仍处于早期阶段的一些有希望的成像进展，例如磁共振弹性成像以及已经纳入临床实践的检查技术。