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Kim J, Nam H, An S, Oh Y, Ji Y, Lee R. SU-E-I-62: A New Metal Artifact Reduction Algorithm Using Edge Preserving Smoothing Filter. Med Phys 2013. [DOI: 10.1118/1.4814172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Ju SG, Huh SJ, Shin JS, Park W, Nam H, Bae S, Oh D, Hong CS, Kim JS, Han Y, Choi DH. Different effects of bladder distention on point A-based and 3D-conformal intracavitary brachytherapy planning for cervical cancer. JOURNAL OF RADIATION RESEARCH 2013; 54:349-356. [PMID: 23104899 PMCID: PMC3589929 DOI: 10.1093/jrr/rrs091] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 09/09/2012] [Accepted: 09/17/2012] [Indexed: 05/30/2023]
Abstract
This study sought to evaluate the differential effects of bladder distention on point A-based (AICBT) and three-dimensional conformal intracavitary brachytherapy (3D-ICBT) planning for cervical cancer. Two sets of CT scans were obtained for ten patients to evaluate the effect of bladder distention. After the first CT scan, with an empty bladder, a second set of CT scans was obtained with the bladder filled. The clinical target volume (CTV), bladder, rectum, and small bowel were delineated on each image set. The AICBT and 3D-ICBT plans were generated, and we compared the different planning techniques with respect to the dose characteristics of CTV and organs at risk. As a result of bladder distention, the mean dose (D50) was decreased significantly and geometrical variations were observed in the bladder and small bowel, with acceptable minor changes in the CTV and rectum. The average D2 cm(3)and D1 cm(3)showed a significant change in the bladder and small bowel with AICBT; however, no change was detected with the 3D-ICBT planning. No significant dose change in the CTV or rectum was observed with either the AICBT or the 3D-ICBT plan. The effect of bladder distention on dosimetrical change in 3D-ICBT planning appears to be minimal, in comparison with AICBT planning.
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Kim J, Nam H, Park S, Wu H, Ye S. Assessment of Tracking Jaws Based on MLC Aperture to Reduce Normal Tissue Irradiation in VMAT. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bae SH, Ahn YC, Nam H, Park HC, Pyo HR, Shim YM, Kim J, Kim K, Ahn JS, Ahn MJ, Park K. High dose involved field radiation therapy as salvage for loco-regional recurrence of non-small cell lung cancer. Yonsei Med J 2012; 53:1120-7. [PMID: 23074111 PMCID: PMC3481375 DOI: 10.3349/ymj.2012.53.6.1120] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To determine the effectiveness of salvage radiation therapy (RT) in patients with loco-regional recurrences (LRR) following initial complete resection of non-small cell lung cancer (NSCLC) and assess prognostic factors affecting survivals. MATERIALS AND METHODS Between 1994 and 2007, 64 patients with LRR after surgery of NSCLC were treated with high dose RT alone (78.1%) or concurrent chemo-radiation therapy (CCRT, 21.9%) at Samsung Medical Center. Twenty-nine patients (45.3%) had local recurrence, 26 patients (40.6%) had regional recurrence and 9 patients (14.1%) had recurrence of both components. The median RT dose was 54 Gy (range, 44-66 Gy). The radiation target volume included the recurrent lesions only. RESULTS The median follow-up time from the start of RT in survivors was 32.0 months. The rates of in-field failure free survival, intra-thoracic failure free survival and extra-thoracic failure free survival at 2 years were 52.3%, 33.9% and 59.4%, respectively. The median survival after RT was 18.5 months, and 2-year overall survival (OS) rate was 47.9%. On both univariate and multivariate analysis, the interval from surgery till recurrence and CCRT were significant prognostic factors for OS. CONCLUSION The current study demonstrates that involved field salvage RT is effective for LRR of NSCLC following surgery.
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Lee JE, Huh SJ, Nam H, Ju SG. Early response of patients undergoing concurrent chemoradiotherapy for cervical cancer: a comparison of PET/CT and MRI. Ann Nucl Med 2012; 27:37-45. [DOI: 10.1007/s12149-012-0659-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Accepted: 09/17/2012] [Indexed: 11/28/2022]
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Park SJ, Shon OJ, Rim JA, Lee JK, Kim JS, Nam H, Kim H. Calixazacrown ethers for copper(II) ion-selective electrode. Talanta 2012; 55:297-304. [PMID: 18968373 DOI: 10.1016/s0039-9140(01)00420-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2001] [Revised: 04/19/2001] [Accepted: 04/23/2001] [Indexed: 11/18/2022]
Abstract
Five novel 1,3-alternate calix[4]azacrown ethers having 2-picolyl, 3-picolyl, and benzyl unit on the nitrogen atom were synthesized and used as ionophores for transition metal-selective polymeric membrane electrodes. The electrode based on 2-picolyl armed 1,3-alternate calix [4] azacrown ether exhibited Nernstian response toward copper (II) ion over a concentration range (10(-4.5) M-10(-2.5) M). The detection limit was determined as 10(-5) M in pH 7 and the selectivity coefficients for possible interfering cations were evaluated. Anions in the sample solution strongly affected the electrode response.
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Bae SH, Park W, Choi DH, Nam H, Kang WK, Park YS, Park JO, Chun HK, Lee WY, Yun SH, Kim HC. Palliative radiotherapy in patients with a symptomatic pelvic mass of metastatic colorectal cancer. Radiat Oncol 2011; 6:52. [PMID: 21600018 PMCID: PMC3130661 DOI: 10.1186/1748-717x-6-52] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Accepted: 05/21/2011] [Indexed: 12/17/2022] Open
Abstract
Background To evaluate the palliative role of radiotherapy (RT) and define the effectiveness of chemotherapy combined with palliative RT (CCRT) in patients with a symptomatic pelvic mass of metastatic colorectal cancer. Methods From August 1995 to December 2007, 80 patients with a symptomatic pelvic mass of metastatic colorectal cancer were treated with palliative RT at Samsung Medical Center. Initial presenting symptoms were pain (68 cases), bleeding (18 cases), and obstruction (nine cases). The pelvic mass originated from rectal cancer in 58 patients (73%) and from colon cancer in 22 patients (27%). Initially 72 patients (90%) were treated with surgery, including 64 complete local excisions; 77% in colon cancer and 81% in rectal cancer. The total RT dose ranged 8-60 Gy (median: 36 Gy) with 1.8-8 Gy per fraction. When the α/β for the tumor was assumed to be 10 Gy for the biologically equivalent dose (BED), the median RT dose was 46.8 Gy10 (14.4-78). Twenty one patients (26%) were treated with CCRT. Symptom palliation was assessed one month after the completion of RT. Results Symptom palliation was achieved in 80% of the cases. During the median follow-up period of five months (1-44 months), 45% of the cases experienced reappearance of symptoms; the median symptom control duration was five months. Median survival after RT was six months. On univariate analysis, the only significant prognostic factor for symptom control duration was BED ≥40 Gy10 (p < 0.05), and CCRT was a marginally significant factor (p = 0.0644). On multivariate analysis, BED and CCRT were significant prognostic factors for symptom control duration (p < 0.05). Conclusions RT was an effective palliation method in patients with a symptomatic pelvic mass of metastatic colorectal cancer. For improvement of symptom control rate and duration, a BED ≥ 40 Gy10 is recommended when possible. Considering the low morbidity and improved symptom palliation, CCRT might be considered in patients with good performance status.
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Maris P, Vary JP, Navrátil P, Ormand WE, Nam H, Dean DJ. Origin of the anomalous long lifetime of ¹⁴C. PHYSICAL REVIEW LETTERS 2011; 106:202502. [PMID: 21668224 DOI: 10.1103/physrevlett.106.202502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Indexed: 05/30/2023]
Abstract
We report the microscopic origins of the anomalously suppressed beta decay of ¹⁴C to ¹⁴N using the ab initio no-core shell model with the Hamiltonian from the chiral effective field theory including three-nucleon force terms. The three-nucleon force induces unexpectedly large cancellations within the p shell between contributions to beta decay, which reduce the traditionally large contributions from the nucleon-nucleon interactions by an order of magnitude, leading to the long lifetime of ¹⁴C.
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Ryu JS, Choi C, Yang S, Nam H, Kim H, Lee MH. Development of prognostic biomarker in pathologic stage I NSCLC patients: Protein expressions involving in DNA damage response. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.7578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Bae SH, Choi DH, Huh SJ, Lim DH, Park W, Nam H, Yang JH, Nam SJ, Lee JE, Im YH, Ahn JS, Park YH. Incidence of Brain Metastasis and Related Subtypes in Patients with Breast Cancer Receiving Adjuvant Radiation Therapy after Surgery. J Breast Cancer 2011. [DOI: 10.4048/jbc.2011.14.s.s57] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Dean DJ, Langanke K, Nam H, Nazarewicz W. Pairing reentrance phenomenon in heated rotating nuclei in the shell-model Monte Carlo approach. PHYSICAL REVIEW LETTERS 2010; 105:212504. [PMID: 21231296 DOI: 10.1103/physrevlett.105.212504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Revised: 09/21/2010] [Indexed: 05/30/2023]
Abstract
Rotational motion of heated 72Ge is studied within the microscopic shell-model Monte Carlo approach. We investigate the angular momentum alignment and nuclear pairing correlations associated with J^{π} Cooper pairs as a function of the rotational frequency and temperature. The reentrance of pairing correlations with temperature is predicted at high rotational frequencies. It manifests itself through the anomalous behavior of specific heat and level density.
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Nam H, Huh S, Ju S, Choi J, Kim B. PET/CT Guided Brachytherapy Planning for Cervical Cancer. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lee J, Choi D, Huh S, Park W, Nam H, Yang J, Nam S, Lee J. Omitting Postoperative Radiation after Excision for Ductal Carcinoma In Situ of the Breast. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nam H, Huh SJ, Park W, Bae DS, Kim BG, Lee JH, Kim CK, Park BK. Prognostic significance of MRI-detected bladder muscle and/or serosal invasion in patients with cervical cancer treated with radiotherapy. Br J Radiol 2010. [DOI: 10.1259/bjr/6646798] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Nam H, Huh SJ, Park W, Bae DS, Kim BG, Lee JH, Kim CK, Park BK. Prognostic significance of MRI-detected bladder muscle and/or serosal invasion in patients with cervical cancer treated with radiotherapy. THE BRITISH JOURNAL OF RADIOLOGY 2010; 83:868-73. [PMID: 20846984 DOI: 10.1259/bjr/66646798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In cervical cancer, the prognostic significance of bladder wall invasion on MRI without pathological evidence of mucosal invasion is not known. From 454 consecutive patients with cervical cancer who were treated with radiation, we reviewed images and analysed the outcome of 92 patients with the Federation of International Gynecology and Obstetrics (FIGO) stage IIIB-IVA. We analysed the patients in three groups, normal, wall (muscle and/or serosal) invasion and mucosal invasion, according to the findings on the MRI. Kaplan-Meier life table analysis and the log-rank test were used to assess the survival rates and differences according to prognostic factors. MRI detected abnormalities in the bladder wall in 42 patients (45.6%): wall invasion in 24 and mucosal invasion in 18. 5 of 18 patients, suspected on MRI to have mucosal invasion, showed no pathological evidence of mucosal invasion. Median follow-up period was 34 months. 3-year cause-specific survival (CSS) in the normal group compared with the wall invasion group was 76.2% vs 71.4% (p = 0.48). 3-year CSS for the wall invasion group compared with the mucosal invasion group was 71.4% vs 54.3% (p = 0.04). Mucosal invasion on MRI (p = 0.03) and concurrent chemoradiotherapy (p = 0.01) was significant for CSS. The prognosis for patients with cervical cancer with evidence of muscle and/or serosal invasion of the bladder on MRI may not differ from that for patients without abnormality on MRI. In patients with the MRI finding of bladder mucosal invasion, further studies should be conducted regarding the role of cystoscopy to determine the need for pathological confirmation.
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Nam H, Huh S, Lee J. Prognostic Significance of MRI-detected Bladder Muscle and/or Serosal Invasion in Cervical Cancer Patients Treated with Radiotherapy. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lee J, Huh S, Nam H, Ju S, Choi J, Kim B. 8050 Usefulness of FDG-PET/CT guided brachytherapy planning in patients with uterine cervical cancer. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71572-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Park D, Nam H, Jung T, Jung H, Lee S, Kim D. 69. Clinical, biochemical and electrophysiological study in chronic alcoholism. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2008.10.087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nam H, Ahn YC, Kim YD, Ko Y, Kim WS. Prognostic significance of anatomic subsites: Results of radiation therapy for 66 patients with localized orbital marginal zone B cell lymphoma. Radiother Oncol 2009; 90:236-41. [DOI: 10.1016/j.radonc.2008.09.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Revised: 09/09/2008] [Accepted: 09/09/2008] [Indexed: 10/21/2022]
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Kwon HM, Kim HK, Cho J, Hong YH, Nam H. Cycloserine-induced encephalopathy: evidence on brain MRI. Eur J Neurol 2008; 15:e60-1. [DOI: 10.1111/j.1468-1331.2008.02171.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Oh D, Huh SJ, Nam H, Park W, Han Y, Lim DH, Ahn YC, Lee JW, Kim BG, Bae DS, Lee JH. Pelvic Insufficiency Fracture After Pelvic Radiotherapy for Cervical Cancer: Analysis of Risk Factors. Int J Radiat Oncol Biol Phys 2008; 70:1183-8. [DOI: 10.1016/j.ijrobp.2007.08.005] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2007] [Revised: 08/02/2007] [Accepted: 08/04/2007] [Indexed: 12/31/2022]
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Park D, Nam H, Kim J, Jeong J, Lee S. 65. Lumbrical and interosseus recording of 700 hands with carpal tunnel syndrome. Clin Neurophysiol 2008. [DOI: 10.1016/j.clinph.2007.11.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nam H, Park W, Huh SJ, Bae DS, Kim BG, Lee JH, Lee JW, Lim DH, Han Y, Park HC, Ahn YC. The prognostic significance of tumor volume regression during radiotherapy and concurrent chemoradiotherapy for cervical cancer using MRI. Gynecol Oncol 2007; 107:320-5. [PMID: 17675222 DOI: 10.1016/j.ygyno.2007.06.022] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Revised: 06/26/2007] [Accepted: 06/29/2007] [Indexed: 11/21/2022]
Abstract
OBJECTIVE The purpose of this study was to determine the prognostic significance of tumor volume regression rate during radiotherapy (RT) measured by three serial magnetic resonance imaging (MRIs) studies performed in patients treated with RT alone and compare the results with patients treated with concurrent chemoradiotherapy (CCRT). METHODS We evaluated 81 patients with uterine cervical cancer who underwent three serial MR examinations, i.e., at the start of RT, at 36-45 Gy of external RT and 1 month after the end of RT. Forty-three patients were treated with RT alone and 38 patients were treated with CCRT. Pre-RT tumor volume (V1), the tumor volume regression rate measured during the fourth week of RT and residual tumor volume at 1 month after the end of RT (V3) were determined for each patient. The cut-off value used for the three parameters studied was the one that made the largest outcome difference. These volume parameters were analyzed to determine a difference in the treatment outcome. RESULTS In the patients treated with CCRT, the mean value of the V1 was larger and the mean value of the V3 was smaller than in patients treated with RT alone. The mean value of the mid-RT regression rate was somewhat higher in patients treated with CCRT than in patients treated with RT alone; however, this difference was not statistically significant (79% vs. 69%). In both the RT alone and the CCRT group, the patients with a mid-RT regression >/=75% had 100% 5-year local control rates and a better disease free survival than the patients with mid-RT regression <75%. The patients with V3=0 cm(3) also had a better 5-year local control rate than the patients with a V3>0 cm(3), but statistical significance was found only in the patients treated with CCRT. CONCLUSIONS The mid-RT tumor volume regression rate, at 36-45 Gy of external RT, was a predictor of local control rate in both RT and CCRT patient groups. However, in the patients who were treated with CCRT, the local control rate difference was even larger by post-RT residual volume than by the mid-RT tumor regression rate. Further studies on appropriate evaluation timing for mid-RT response in patients receiving CCRT are needed.
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Nam H, Wright SM, Kurpad KN. Applications of RF current sources for transmit phased array. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2004:1108-11. [PMID: 17271877 DOI: 10.1109/iembs.2004.1403358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Current practice in MRI trends towards higher static magnetic field (B/sub 0/) because of the advantage of signal-to-noise ratio (SNR). However at high magnetic fields, the interaction between a coil and a load becomes significant, thus making current distribution on RF coils disturbed and causing transverse magnetic (B/sub 1/) field inhomogeneity. A novel approach to optimize B/sub 1/, field homogeneity is to use a transmit phased array and adjust the amplitudes and phases of the currents on each element independently. However, independent control is difficult to achieve in conventional arrays due to coupling between elements. In addition, the currents are generally load dependent. In this paper we show that a RF current source is an effective method for controlling the current on each element of the transmit phased array, and that the RF current source is much less sensitive to loading and a interelement coupling than a conventional 50Omega matched coil.
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