A comparison of CT scan to transrectal ultrasound-measured prostate volume in untreated prostate cancer

Hoffelt, S. Christopher; Marshall, Lynn M.; Garzotto, Mark; Hung, Arthur; Holland, John J.; Beer, Tomasz M.

doi:10.1016/s0360-3016(03)00509-1

Cited by 67 publications

(39 citation statements)

References 21 publications

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“…The delineation of the target on CT slices has inter‐observer and intra‐observer variation and, based on reports in the external‐beam radiation therapy literature, can sometimes be overestimated by as much as 30%. ( 14 – 18 ) As prostate movement is observed relative to catheter displacement, we can also imagine the interfractional movement of critical organs such as bladder and rectum (the urethra may move together with the prostate). The uncertainty attributable to the delineation of the target and OARs on CT images can also make a contribution to dose variation between fractions.…”

Section: Discussionmentioning

confidence: 99%

Measurement of craniocaudal catheter displacement between fractions in computed tomography–based high dose rate brachytherapy of prostate cancer

Kim

Hsu

Pouliot

2007

J Applied Clin Med Phys

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The objective of the present work was to measure the craniocaudal displacement of catheters occurring between consecutive fractions of transrectal ultrasound (TRUS)‐guided high dose rate (HDR) prostate brachytherapy. Ten consecutive patients were treated with 2 fractions of 9.5‐Gy TRUS‐guided HDR brachytherapy, with dental putty being used for the fixation of catheters. For each patient, a computed tomography (CT) scan with 3‐mm slice thickness was acquired before each of the 2 fractions. Two different references were used to measure the catheter displacement between fractions: the ischial bone as a bony marker (BM) and the center of two gold markers (COGM) implanted in the prostate. Catheter displacement was calculated by multiplying the thickness of the CT slice by the difference in number of CT slices between the reference slice and the slice containing the tip of a catheter. The average magnitude of caudal catheter displacement was 2.7 mm (range: −6.0 mm to 13.5 mm) for the BM method and 5.4 mm (range: −3.75 mm to 18.0 mm) for the COGM method. The measurement data obtained from the BM and COGM methods verified that prostate movement and catheter displacement both occurred independently between fractions. The most anterior and medial two catheters (catheter positions 8 and 12) had the greatest tendency to be displaced in the caudal direction because they were located at the most distant position from the fulcrum, making them susceptible to rotation of the dental putty in the lateral plane because of the movement of the patients’ legs between fractions. In conclusion, the combination of the BM and COGM methods can demonstrate prostate and catheter movement relative to the BM between fractions. Our technique found a pattern of catheter displacement. Based on that finding, further improvement of our results may be possible by modification of our current technique.PACS number: 87.53.Jw

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Section: Discussionmentioning

confidence: 99%

Measurement of craniocaudal catheter displacement between fractions in computed tomography–based high dose rate brachytherapy of prostate cancer

Kim

Hsu

Pouliot

2007

J Applied Clin Med Phys

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“…Age, prostate-specific antigen (PSA), prostate volume, and symptoms were used to assess the risk of disease progression, but the 2 most deeply investigated risk factors are PSA and prostate volume (4). Prostate volume is an important parameter in diagnosis and treatment of both benign and malign prostate disease (5,6). For BPH, prostate volume is important in predicting response to 5α-reductase therapy and is also used to select which surgical treatment modality is the best for the patient (7,8).…”

Section: Introductionmentioning

confidence: 99%

What is the best radiological method to predict the actual weight of the prostate?

Kılıç¹,

Özdemır²,

Altinova³

et al. 2014

Turk J Med Sci

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The purpose of the present study was to investigate the composition of kidney stones removed from human patients. Seventeen samples were collected after surgery (5 females and 12 males; age range 2 to 60 years). The samples were analyzed for composition by transmission Fourier transform infrared (FT-IR) spectroscopy. The 17 analyzed samples of kidney stones comprised 29.4% calcium oxalate, 29.4% uric acid, 29.4% calcium oxalate (CaOx)-uric acid, 5.9% phosphate, and 5.9% calcium oxalate-phosphate stones. The results of the study indicated that transmission FT-IR spectroscopy could be used as an environmentally friendly technique for rapid screening of kidney stones.

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“…As shown in Figure 2, prostate contours could be erroneously delineated by investigators. It has been reported that prostates are significantly larger on CT images than on MRI or US images [14,15], especially the seminal vesicles and apex. In addition, significant interobserver variation was also reported in prostate delineation on CT images [16,17].…”

Section: Discussionmentioning

confidence: 98%

Dosimetry of permanent interstitial prostate brachytherapy for an interoperative procedure, using O-arm based CT and TRUS

Ishiyama¹,

Sekiguchi²,

Satoh

et al. 2016

jcb

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Purpose: The aim of this report is dosimetric evaluation for an intraoperative fusion computed tomography (CT) as a superior predictor of 1-month CT based dosimetry in comparison to transrectal ultrasound (TRUS) in permanent interstitial prostate brachytherapy.Material and methods: Data of 65 patients treated with seed implantation were analyzed. All procedures has been performed with patients in the lithotomy position inside the O-arm system. An end-fine probe is used as a landmark to fuse TRUS and O-arm-based CT images. There was no difference in the patient's position, probe position, and timing of image acquisition between the two imaging modalities. Dose-volume histogram (DVH) parameters such as the dose to 90% of prostate volume (D 90 ) has been analyzed.Results: The area under the curve of the receiver operating characteristic tended to be larger on fusion CT than on TRUS for most DVH parameters (71.85% vs. 59.59% for D 90 ; p = 0.07). Significant relationships between fusion CT and 1-month CT were confirmed using Pearson's correlation coefficients for most DVH parameters (R = 0.48, p < 0.01 for D 90 ), although the relationship between TRUS and 1-month CT was poor. Large dose reduction (35 Gy for D 90 ) was seen from TRUS to fusion CT, especially in patients with high body weight and small prostate volume.Conclusions: Intraoperative fusion CT appears to have higher predictive power for 1-month CT-based dosimetry than TRUS. A prospective trial using fusion CT-based planning is warranted.J Contemp Brachytherapy 2016; 8, 1: 7-16 DOI: 10.5114/jcb.2016.57817Key words: brachytherapy, intraoperative CT, low dose rate, O-arm system, prostate cancer. PurposeTransrectal ultrasound (TRUS) is the standard imaging tool for interstitial prostate brachytherapy [1]. The prostate, urethra, and rectum are usually contoured on TRUS images, and treatment is planned based on these contours. In addition, these contours could be modified in a realtime manner during surgery. Meanwhile, it is a wellknown fact that ultrasound is not suitable for imaging implanted seeds [2,3]. Although computed tomography (CT) is not available in the usual operating room, the guideline of the American Brachytherapy Society recommended CT as the gold standard for detecting seed position and calculating post-implant dose volume histograms (DVHs) [4].The O-arm ® surgical imaging system (Medtronic, Dublin, Ireland) was developed to provide real-time, intraoperative CT imaging with a large field-of-view. This system permits patients to be in the lithotomy position even during image acquisition because the bore diameter of this system (965 mm) is significantly larger than that of conventional CT (700-800 mm). However, soft tissues such as the prostate or rectum are difficult to delineate with this system because of its lower contrast resolution compared to conventional CT, although high-density structures such as bone or seeds that are made from titanium can be clearly imaged.Therefore, we combined O-arm-based CT and TRUS during surgery as a new...

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A comparison of CT scan to transrectal ultrasound-measured prostate volume in untreated prostate cancer

Cited by 67 publications

References 21 publications

Measurement of craniocaudal catheter displacement between fractions in computed tomography–based high dose rate brachytherapy of prostate cancer

Measurement of craniocaudal catheter displacement between fractions in computed tomography–based high dose rate brachytherapy of prostate cancer

What is the best radiological method to predict the actual weight of the prostate?

Dosimetry of permanent interstitial prostate brachytherapy for an interoperative procedure, using O-arm based CT and TRUS

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