Abstract:
PURPOSE:To analyze the effect of a decrease in computed tomographic (CT) colonographic voltage, from 100 and 120 kVp to 80 kVp and reconstructed with filtered back projection ( FBP filtered back projection ), on radiation dose, image noise, and diagnostic performance in anthropomorphic phantoms and to assess the effect of iterative reconstruction ( IR iterative reconstruction ) algorithms on radiologists' performance for 80-kVp CT colonography. MATERIALS AND METHODS:Seven colon phantoms with 68 simulated polyps (≥6 mm) were scanned at three peak voltage settings (80, 100, 120 kVp) and 10 mAs. Images were reconstructed by using FBP filtered back projection , hybrid statistic-based IR iterative reconstruction , and knowledge-based IR iterative reconstruction algorithms. Effective radiation dose, image noise, and per-polyp sensitivity were recorded and compared by two reviewers with Friedman test, repeated measures analysis of variance, and McNemar test. RESULTS:Median size-specific dose estimate and effective radiation dose of 80-kVp CT colonography was 0.231 mGy and 0.167 mSv, respectively, which was lower than with 100- and 120-kVp CT colonography, with significant difference between 80 and 120 kVp (P = .0005). Image noise (202.0 HU) at 80-kVp FBP filtered back projection CT colonography was significantly higher than at 100-kVp FBP filtered back projection (139.1 HU) and 120-kVp FBP filtered back projection (120.4 HU) (P < .0001). Per-polyp sensitivity (reviewer 1, 14.7% [10 of 68]; reviewer 2, 7.4% [five of 68]) at 80-kVp FBP filtered back projection was significantly lower than at 100-kVp FBP filtered back projection (reviewer 1, 57.4% [39 of 68]; reviewer 2, 39.7% [27 of 68]) and 120-kVp FBP filtered back projection (reviewer 1, 85.3% [58 of 68]; reviewer 2, 83.8% [57 of 68]) (P < .0001). With statistic-based IR iterative reconstruction , image noise at 80 kVp decreased significantly (52.8% [106.7 HU of 202.0 HU]) compared with that at 80-kVp FBP filtered back projection (P < .0001), but per-polyp sensitivity (reviewer 1, 79.4% [54 of 68]; reviewer 2, 66.2% [45 of 68]) at 80-kVp statistic-based IR iterative reconstruction remained significantly lower than at 100-kVp statistic-based IR iterative reconstruction (reviewer 1, 95.6% [65 of 68]; reviewer 2, 86.8% [59 of 68]) (P = .001) and 120-kVp statistic-based IR iterative reconstruction (reviewer 1, 98.5% [67 of 68]; reviewer 2, 89.7% [61 of 68]) (P < .001). For knowledge-based IR iterative reconstruction , per-polyp sensitivity at 80 kVp was improved to 98.5% (67 of 68) and 94.1% (64 of 68), not significantly different from that at 100 kVp (reviewer 1, 100% [68 of 68]; reviewer 2, 95.6% [65 of 68]) and 120 kVp (reviewer 1, 100% [68 of 68]; reviewer 2, 95.6% [65 of 68]) (P > .999). CONCLUSION:A decrease in tube voltage to 80 kVp caused reduction in radiation dose (0.166 mSv) with deterioration in image noise and per-polyp sensitivity. By using a knowledge-based IR iterative reconstruction algorithm, radiologists' performance of 80-kVp CT colonography was acceptable and on par with that at 100- or 120-kVp CT colonography.
journal_name
Radiologyjournal_title
Radiologyauthors
Shin CI,Kim SH,Lee ES,Lee DH,Hwang EJ,Chung SY,Lee JM,Han JK,Choi BIdoi
10.1148/radiol.14140192subject
Has Abstractpub_date
2014-12-01 00:00:00pages
759-71issue
3eissn
0033-8419issn
1527-1315journal_volume
273pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract:PURPOSE:To retrospectively compare the detection and characterization of hepatic perfusion disorder (HPD) associated with focal liver lesions (FLLs) at contrast material-enhanced ultrasonography (US) by using contrast-enhanced computed tomography (CT) as the reference standard. MATERIALS AND METHODS:The study was appr...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.11101454
更新日期:2011-07-01 00:00:00
abstract::The purpose of this study was to develop an automated scheme to facilitate detection of localized ground-glass opacity (GGO) in the lung at computed tomography (CT). Institutional review board approval and informed consent were not required. Two radiologists reviewed CT images from 14 patients (five men, nine women) w...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2372041461
更新日期:2005-11-01 00:00:00
abstract:PURPOSE:To assess the frequency of hyperintensity in the dentate nucleus on T1-weighted magnetic resonance (MR) images and to establish correlations between such hyperintensity and clinical factors, including a history of brain irradiation. MATERIALS AND METHODS:This study was approved by the institutional review boar...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.10100508
更新日期:2011-01-01 00:00:00
abstract::Transrectal ultrasound (US; also called endosonography) was used to evaluate known or suspected rectal and perirectal masses. Thirty-one patients were examined with commercially available endosonographic probes. Those who obtained and interpreted the sonograms had no knowledge of other diagnostic studies, which includ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.157.2.3901110
更新日期:1985-11-01 00:00:00
abstract::Sixty-five patients with suspected ear disease were examined with CT, and abnormalities were detected in 42 of them; 58 of these patients also had pluridirectional tomographic examinations. Eighteen of the patients in whom abnormalities were detected underwent exploratory surgery. CT was useful in the diagnosis of tym...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.147.3.6844610
更新日期:1983-06-01 00:00:00
abstract::Gastric polyps were found in 38 patients in a series of 2,420 consecutive double-contrast studies of the upper gastrointestinal tract. The resulting incidence of 1.6% is four times the highest figure previously reported. Single polyps were usually located in the antrum, multiple polyps in the body of fundus. Two-third...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.134.1.7350630
更新日期:1980-01-01 00:00:00
abstract::The influence of viewing time on the detectability of subtle and obvious lung cancers was studied. Frontal chest radiographs of 40 patients with subtle cancers, 40 patients with obvious cancers, and 40 healthy control subjects were shown to four observers for four different viewing times (0.25 second, 1 second, 4 seco...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.166.2.3336720
更新日期:1988-02-01 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::High-frequency (10-MHz) sonography demonstrated a cervical mass or lymphadenopathy, or both, during postoperative follow-up of 52 patients who had undergone surgery for thyroid cancer. Percutaneous biopsy with ultrasonographic (US) guidance was performed in all 52 masses, 44 of which were nonpalpable. Malignant cells ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.168.3.3043550
更新日期:1988-09-01 00:00:00
abstract::Exfoliative cytology of bile aspirated from percutaneously placed combined external/internal biliary drainage catheters yielded positive results in 34% of 100 cases. There were no false-positive results. Bile cytology is a simple, inexpensive, and useful method which can establish a diagnosis of malignant biliary obst...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.149.3.6647860
更新日期:1983-12-01 00:00:00
abstract:PURPOSE:To determine whether addition of quality measure (QM) of shear-wave (SW) velocity (Vs) estimation can increase SW elastography sensitivity for breast cancer. MATERIALS AND METHODS:With written informed consent, this institutional review board-approved, HIPAA-compliant study included 143 women (mean age, 48.5 y...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.14132404
更新日期:2015-04-01 00:00:00
abstract::Although intravascular foreign bodies are routinely removed with percutaneous extraction, surgical retrieval is performed of most nonvascular foreign bodies. The authors describe six cases in which percutaneous extraction was performed for removal of nonvascular foreign bodies. These foreign bodies included an intraab...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.187.3.8497610
更新日期:1993-06-01 00:00:00
abstract:PURPOSE:To evaluate the effect of the increase in total cross-sectional area of arteries as they branch beyond the main trunks on the resistive index (RI) and early systolic acceleration (ESA). MATERIALS AND METHODS:An essentially noncompliant in vitro model that used a pulsatile pump, blood-mimicking fluid, and a bra...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.212.3.r99se13732
更新日期:1999-09-01 00:00:00
abstract::Computed tomography (CT) used in cases of blunt abdominal trauma has been found sensitive in detection of bowel and mesenteric injuries and discrimination of operable from nonoperable candidates. In 51 patients with suspected bowel or mesenteric injury following blunt abdominal trauma, CT correctly depicted bowel hema...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.173.1.2781000
更新日期:1989-10-01 00:00:00
abstract:PURPOSE:To determine whether the carpal lunotriquetral ligament (LTL) can be consistently seen and to establish the normal range of LTL appearances at magnetic resonance (MR) imaging as a basis for comparison with LTL tears. MATERIALS AND METHODS:MR imaging was used to identify and characterize the LTL in 75 wrists wi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.191.1.8134570
更新日期:1994-04-01 00:00:00
abstract::Purpose To compare low- versus high-frequency ultrasonographic (US) elastography for detection of steatohepatitis in rats by using histopathologic findings as the reference standard. Materials and Methods Between March and September 2014, after receiving approval from the institutional animal care committee, 60 male S...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2016160308
更新日期:2017-03-01 00:00:00
abstract::Seven patients with lung tumors underwent percutaneous implantation of iodine-125 sources into the tumor. Needle placement and seed implantation were effected with biplane fluoroscopy and a computer planning model based on computed tomography. No complications were encountered. Five of the seven patients underwent the...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.164.3.3615870
更新日期:1987-09-01 00:00:00
abstract::A prospective study had demonstrated the clinical usefulness of water-delay ultrasound as a means of routinely imaging the intracranial contents in infants younger than one year of age. Correlation between ultrasound and CT images was excellent, showing both normal and pathological anatomy. This technique is most help...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.134.1.7350600
更新日期:1980-01-01 00:00:00
abstract::Injection cholecystography is often employed during invasive gallbladder procedures to determine the number of gallstones that are present. The authors undertook this study to define the optimal radiographic technique for performance of injection cholecystography. Condoms filled with 100 mL of contrast medium at four ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.180.1.2052720
更新日期:1991-07-01 00:00:00
abstract::Ten patients suspected of having cervical carcinoma underwent magnetic resonance (MR) imaging before and after opacification of the vagina with a mixture of barium, water, and maltodextrin/calcium lactate. Use of vaginal contrast medium resulted in improved visualization of the vaginal wall, lumen, and fornices in all...
journal_title:Radiology
pub_type: 临床试验,杂志文章
doi:10.1148/radiology.213.2.r99oc23608
更新日期:1999-11-01 00:00:00
abstract:PURPOSE:To evaluate the imaging characteristics of an amorphous silicon flat-panel detector (FPD) for digital chest radiography. MATERIALS AND METHODS:The 41 x 41-cm digital FPD is constructed on a single monolithic glass substrate with a structured cesium iodide scintillator layer and an amorphous silicon thin-film t...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.218.3.r01fe45683
更新日期:2001-03-01 00:00:00
abstract::Two cases of vertebral sarcoidosis in pediatric patients are presented. All such patients reported have been black, 13-15 years old, and have a history of back pain. Radiographs of the involved vertebrae show primarily lytic destruction with sclerotic borders in some of the lesions. Fungal infections, tuberculosis, py...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/121.1.153
更新日期:1976-10-01 00:00:00
abstract:PURPOSE:To investigate the evolution of metabolic changes detectable with proton magnetic resonance (MR) spectroscopic imaging in acute stroke and to compare these findings with those of conventional MR imaging. MATERIALS AND METHODS:A patient with middle cerebral artery stroke underwent conventional proton-density (P...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.192.3.8058940
更新日期:1994-09-01 00:00:00
abstract:PURPOSE:To investigate the effects of increasing doses of angiotensin II on hepatic hemodynamics in the normal rabbit liver and in hepatic VX2 tumors by using dynamic contrast material-enhanced perfusion computed tomography (CT). MATERIALS AND METHODS:This study was approved by the institutional animal care and use co...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.11101868
更新日期:2011-09-01 00:00:00
abstract::The authors reviewed the accuracy of stereotaxic fine-needle aspiration cytology in prediction of the presence of cancer. Seventy-four nonpalpable breast cancers and 144 benign lesions were studied. The rate of obtaining an inadequate sample was 8.1% for cancers and 20.8% for benign lesions. None of the cytology repor...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.173.1.2675190
更新日期:1989-10-01 00:00:00
abstract::Purpose To evaluate a CT structural analysis protocol (SAP) for estimating the strength of human female cadaveric spines with lytic lesions. Materials and Methods Osteolytic foci was created in the middle vertebra of 44 thoracic and lumbar three-level segments from 11 female cadavers (age range, 50-70 years). The segm...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2018171139
更新日期:2018-08-01 00:00:00
abstract::In their effort to characterize the systemic "off-target" effects of radiofrequency (RF) ablation and irreversible electroporation (IRE), Bulvik et al demonstrated substantial differences in physiologic, tumorigenic, and immunologic responses between the two ablative modalities. By establishing that IRE may in fact st...
journal_title:Radiology
pub_type: 评论,杂志文章,评审
doi:10.1148/radiol.2016160505
更新日期:2016-08-01 00:00:00
abstract::On rare occasions, excessive lipase production by functioning pancreatic acinar cell carcinoma results in subcutaneous and intraosseous fat necrosis. A patient with subcutaneous nodules and osteolytic lesions from metastatic fat necrosis associated with this malignancy is reported. Prompt recognition of the syndrome l...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.158.1.3940400
更新日期:1986-01-01 00:00:00
abstract::The authors describe the value of computed tomographic (CT) guidance for percutaneous gastrostomy (PG) or gastroenterostomy (PGE) in 22 patients with anatomic or pathologic difficulties precluding fluoroscopic guidance. Indications for PG or PGE were decompression for gastrointestinal obstruction (n = 15) or for feedi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.184.1.1609080
更新日期:1992-07-01 00:00:00
abstract::Purpose To compare the diagnostic performance of minimally invasive autopsy with that of conventional autopsy. Materials and Methods For this prospective, single-center, cross-sectional study in an academic hospital, 295 of 2197 adult cadavers (mean age: 65 years [range, 18-99 years]; age range of male cadavers: 18-99...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2018180924
更新日期:2018-12-01 00:00:00