Abstract:
PURPOSE:To prospectively determine the cellular iron uptake by using R2 and R2* mapping with multiecho readout gradient-echo and spin-echo sequences. MATERIALS AND METHODS:All experiments were approved by the institutional animal care committee. Lung carcinoma cells were lipofected with superparamagnetic iron oxides (SPIOs). Agarose gel phantoms containing (a) 1 x 10(5) CCL-185 cells per milliliter of agarose gel with increasing SPIO load (0.01-5.00 mg of iron per milliliter in the medium), (b) different amounts (5.0 x 10(3) to 2.5 x 10(5) cells per milliliter of agarose gel) of identically loaded cells, and (c) free (non-cell-bound) SPIOs at the iron concentrations described for (b) were analyzed with 3.0-T R2 and R2* relaxometry. Iron uptake was analyzed with light microscopy, quantified with atomic emission spectroscopy (AES), and compared with MR data. For in vivo relaxometry, agarose gel pellets containing SPIO-labeled cells, free SPIO, unlabeled control cells, and pure agarose gel were injected into three nude mice each. Linear and nonlinear regression analyses were performed. RESULTS:Light microscopy and AES revealed efficient SPIO particle uptake (mean uptake: 0.22 pg of iron per cell +/- 0.1 [standard deviation] for unlabeled cells, 31.17 pg of iron per cell +/- 4.63 for cells incubated with 0.5 mg/mL iron). R2 and R2* values were linearly correlated with cellular iron load, number of iron-loaded cells, and content of freely dissolved iron (r(2) range, 0.92-0.99; P < .001). For cell-bound SPIO, R2* effects were significantly greater than R2 effects (P < .01); for free SPIO, R2 and R2* effects were similar. In vivo relaxometry enabled accurate prediction of the number of labeled cells. R2' (R2* - R2) mapping enabled differentiation between cell-bound and free iron in vitro and in vivo. CONCLUSION:Quantitative R2 and R2* mapping enables noninvasive estimations of cellular iron load and number of iron-labeled cells. Cell-bound SPIOs can be differentiated from free SPIOs with R2' imaging.
journal_name
Radiologyjournal_title
Radiologyauthors
Kuhlpeter R,Dahnke H,Matuszewski L,Persigehl T,von Wallbrunn A,Allkemper T,Heindel WL,Schaeffter T,Bremer Cdoi
10.1148/radiol.2451061345subject
Has Abstractpub_date
2007-11-01 00:00:00pages
449-57issue
2eissn
0033-8419issn
1527-1315pii
2451061345journal_volume
245pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract::Clinical, angiographic, scintigraphic and pathologic observations in myocardial contusion were correlated. Radionuclide imaging of the injured heart with 99mTc-Sn-polyphosphate provides an accurate diagnosis in acute, even mild, myocardial contusion. The study can be carried out without danger to the critically ill pa...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/116.3.679
更新日期:1975-09-01 00:00:00
abstract::Pulmonary tuberculosis has long been associated with the formation of cavities in the lung. Many reports in the literature indicate that the occurrence of air-fluid levels in tuberculosis is unusual. The authors present 18 cases of proved active cavitary tuberculosis where air-fluid levels occurred during the active p...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/127.2.315
更新日期:1978-05-01 00:00:00
abstract::Tumors of the skull base frequently have some blood supply from cavernous branches of the internal carotid artery (ICA). Preoperative embolization of such pedicles can expedite the subsequently performed surgery. Sometimes, however, the tumor vessels are multiple and very small so selective catheterizations are not po...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.181.3.1947090
更新日期:1991-12-01 00:00:00
abstract::A 6-year follow-up study of height and weight was conducted between 1975 and 1983 in a total of 149 sibling pairs of the same sex, one of whom had been exposed to diagnostic ultrasound in utero. The data were analyzed for the entire sample group, as well as for subgroups defined by sex, gestational age at delivery, bi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.166.3.3277240
更新日期:1988-03-01 00:00:00
abstract:PURPOSE:To analyze difficult diagnostic cases of malrotation to identify features crucial to accurate diagnosis. MATERIALS AND METHODS:The authors reviewed the radiographs and records of 81 symptomatic children who underwent surgery with a preoperative diagnosis of malrotation. Eleven had subtle rotational abnormaliti...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.198.3.8628870
更新日期:1996-03-01 00:00:00
abstract::An International Symposium was held in Atlanta in 1992 to present the state of the art of diagnostic evaluation and management of acute pancreatitis and to agree on an acceptable series of clinical definitions for classifying the disease and its complications. The symposium was composed of 40 internationally recognize...
journal_title:Radiology
pub_type: 杂志文章,评审
doi:10.1148/radiology.193.2.7972730
更新日期:1994-11-01 00:00:00
abstract:PURPOSE:To test the hypothesis that rapid and accurate performance of the proficient observer in mammogram interpretation involves a shift in the mechanism of image perception from a relatively slow search-to-find mode to a relatively fast holistic mode. MATERIALS AND METHODS:This HIPAA-compliant study had institution...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2422051997
更新日期:2007-02-01 00:00:00
abstract::The ability of film readers to detect a nodular target abnormality with the peripheral vision was studied using a gray structureless background, chest radiographs with a bilateral pneumothorax and chest radiographs with pulmonary vasculature. Peripheral detection of the nodular abnormality was profoundly decreased by ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/114.2.269
更新日期:1975-02-01 00:00:00
abstract::Although some cerebral vascular malformations are angiographically occult, the correct diagnosis may be suggested by their appearance on computed tomography (CT). The authors advise caution in assuming that angiographically avascular lesions which show contrast enhancement on CT represent neoplasms rather than vascula...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/123.3.649
更新日期:1977-06-01 00:00:00
abstract::Innovations in design of a dedicated breast scanner resulted in automation of the scanning process, the production of high resolution images of the whole breast and an efficient mode of image review. The results of clinical evaluation of the prototype of this breast scanner investigating normal breasts as well as beni...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.137.2.6254110
更新日期:1980-11-01 00:00:00
abstract::A screening study with transrectal ultrasound (US) and digital rectal examination to diagnose early prostate cancer was performed to calculate diagnostic costs. The total costs of screening 784 men were $130,400 with transrectal US and $41,080 with digital rectal examination. Per diagnosed cancer, the costs were $6,52...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.169.2.3140290
更新日期:1988-11-01 00:00:00
abstract:PURPOSE:To define age-specific patterns of distribution of red and yellow marrow about the shoulder. MATERIALS AND METHODS:Red and yellow marrow distribution was reviewed on magnetic resonance images of 189 subjects aged 15-69 years. Double-echo and fast spin-echo, gradient, and short inversion time inversion recovery...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.192.1.8208940
更新日期:1994-07-01 00:00:00
abstract::The vlue of epinephrine enhanced angiography in the preoperative distinction of isolated hamartoma (angiomyolipoma without stigma of tuberous sclerosis) from hypernephroma has been largely discounted in the past. The authors performed this procedure in 6 patients (4 with isolated hamartoma and 2 with tuberous sclerosi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/132.1.61
更新日期:1979-07-01 00:00:00
abstract:PURPOSE:To assess the frequency of splenic vein thrombosis (SVT) after splenectomy and its consequences on patient treatment. MATERIALS AND METHODS:A group of 183 consecutive patients who underwent splenectomy were evaluated. Of these patients, 119 underwent postoperative ultrasound (US) or computed tomography. RESUL...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.190.1.8259430
更新日期:1994-01-01 00:00:00
abstract:PURPOSE:To determine diagnostic accuracy of four-channel multi-detector row computed tomography (CT) in emergency room and inpatient populations suspected of having acute pulmonary embolism (PE) who prospectively underwent both CT and pulmonary arteriography (PA). MATERIALS AND METHODS:Patients referred for PA to asse...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2333031744
更新日期:2004-12-01 00:00:00
abstract:PURPOSE:To describe our experience with stereotactic histologic biopsy in patients with breast implants. MATERIALS AND METHODS:Thirty-one (1.3%) of 2,399 consecutive lesions on which stereotactic histologic biopsy was performed were in breasts containing implants. Biopsy difficulties were evaluated for lesions in brea...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2221010231
更新日期:2002-01-01 00:00:00
abstract:PURPOSE:To prospectively evaluate fluorine 18 ((18)F) 2-fluoropropionyl-labeled PEGylated dimeric arginine-glycine-aspartic acid (RGD) peptide (PEG3-E[c{RGDyk}]2) (FPPRGD2) positron emission tomography (PET) in patients with glioblastoma multiforme (GBM). MATERIALS AND METHODS:The institutional review board approved t...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2015141550
更新日期:2015-11-01 00:00:00
abstract::Dilatation of the aortic root, outlined by a periaortic fat layer, was observed in 19 of 25 successive cases of aneurysm of the ascending aorta. In one of these cases the aneurysm was entirely confined to the aortic root. In two other cases the aneurysms could not be detected on standard chest radiographs judged in th...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.138.3.7465830
更新日期:1981-03-01 00:00:00
abstract:PURPOSE:To retrospectively determine the frequency and severity of various abnormal laboratory test values following percutaneous cryoablation of liver tumors and to estimate the correlation between laboratory test values and tumor and ablation volumes. MATERIALS AND METHODS:This HIPAA-compliant study had institutiona...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2481061874
更新日期:2008-07-01 00:00:00
abstract::A 68-year-old man had a painless, nontender lump in the right infrascapular region. An unenhanced computed tomography (CT) scan showed a soft-tissue mass attached to the scapula, causing muscular displacement. A similar, smaller mass was found on the left side. The appearance of the masses on CT scans was suggestive o...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.160.2.3726110
更新日期:1986-08-01 00:00:00
abstract::Sonographic analysis of the sciatic nerve was performed in vitro (anatomic specimen), in vivo (healthy volunteers), and in 16 patients with suspected peripheral sciatic nerve lesions. The ultrasound (US) examinations were performed with standard and high-resolution US equipment with linear-array configuration. The nor...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.181.2.1924780
更新日期:1991-11-01 00:00:00
abstract::History A 47-year-old Sudanese man without a known remarkable medical history presented to the emergency department for a syncopal episode. The patient denied chest pain, dyspnea, focal weakness, or prior similar episodes. He was originally from north Sudan and eventually moved to Saudi Arabia, where he worked as a fa...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2019171769
更新日期:2019-10-01 00:00:00
abstract::A case of a postcholecystectomy patient is presented in which an initially grossly dilated common hepatic duct returned to normal size within several minutes. We have tried to explain this phenomenon using known facts abut bile duct elasticity and bile flow, and conclude that such rapid size change probably only occur...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.140.1.7244220
更新日期:1981-07-01 00:00:00
abstract::A simple device is described that can reduce personnel exposure from scatter radiation by up to 75%. The device consists of an oblong piece of shielding (0.75-mm lead equivalent) that is taped to the side of the patient during percutaneous renal stone removal and other interventional procedures. Contrary to other shie...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.159.3.3704160
更新日期:1986-06-01 00:00:00
abstract::Enemas of various solutions were administered to rats to determine if Gastrografin was specifically irritating to the colonic mucosa. Gastrografin was found to cause considerably more inflammation than Hypaque-25, or barium sulfate. Further studies with hypertonic sorbitol, Renografin-76, and Tween 80 suggested that (...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/118.3.545
更新日期:1976-03-01 00:00:00
abstract:PURPOSE:To evaluate two-phase helical computed tomography (CT) in the characterization of salivary gland tumors. MATERIALS AND METHODS:Sixty-four patients with major salivary gland tumors underwent two-phase helical CT. The histopathologic diagnosis was obtained by means of surgical resection or biopsy in all patients...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.214.1.r00ja05231
更新日期:2000-01-01 00:00:00
abstract::Portosystemic venous collaterals were studied with sonography in 40 patients with known portal hypertension. Eight patients had technically inadequate scans, while 32 had optimal scans. Sixty groups of venous collaterals were identified. At least one collateral pathway was seen in 28 patients, for a sensitivity of 88%...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.146.1.6849040
更新日期:1983-01-01 00:00:00
abstract::Two patients with pneumothorax had ventilation-perfusion studies to rule out the possibility of pulmonary embolism; the presence of air in the pleural space was not known to the authors when the study was analyzed. A typical ventilatory pattern characterized by small volume difference at total lung capacity followed b...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/129.1.119
更新日期:1978-10-01 00:00:00
abstract::Images from endoscopic retrograde pancreatography performed in 38 patients with cystic pancreatic neoplasms were reviewed to determine whether they might allow differentiation of malignant from benign lesions. Twenty-three patients had histologically proved benign lesions; 15 had frankly malignant lesions. Images were...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.188.3.8394590
更新日期:1993-09-01 00:00:00
abstract:PURPOSE:To compare the occurrence of several central sulcus variants and to assess the reproducibility of a sulcal pattern named the power button sign (PBS) in patients with type 2 focal cortical dysplasia (FCD2) and healthy control subjects. MATERIALS AND METHODS:The local institutional review board approved the stud...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.14140773
更新日期:2015-02-01 00:00:00