brachytherapy

Brachy grids play a critical role in modern prostate procedures by helping clinicians place needles with exceptional accuracy during prostate brachytherapy and transperineal prostate biopsy. Used alongside an ultrasound probe and stepper stabiliser, a brachy grid provides a fixed coordinate system that improves precision, treatment consistency, and patient safety. What Is a Brachy Grid? A brachy grid, also known as a template grid or perineal template, is a medical device used to guide needle placement through the perineum during prostate procedures. It is mounted onto a stepper stabiliser and aligned with the probe, creating a precise coordinate system that allows clinicians to target specific areas of the prostate. Most brachy grids feature a matrix of evenly spaced holes, commonly 5 mm apart, although some systems use 3 mm spacing for finer targeting. Each hole is identified by a letter and number, enabling accurate documentation and repeatable needle placement. The grid is most commonly used in: According to the American Association of Physicists in Medicine (AAPM) and peer-reviewed literature, template-guided needle placement has become a standard component of modern prostate brachytherapy because it improves implant accuracy and dosimetric outcomes. What are the functions of Brachy Grid? 1. Provides Precise Needle Guidance The primary function of brachy grid is to guide needles into the prostate with a high level of precision. Rather than relying on freehand needle placement, clinicians insert the biopsy gun through a predefined hole in the grid. The grid acts as a physical guide, helping maintain the planned entry point while reducing unwanted movement. This level of precision is particularly important because even a small deviation can affect seed placement or tissue sampling. Studies published in Brachytherapy and Medical Physics have shown that template-guided procedures improve needle placement accuracy and contribute to better treatment quality. 2. Creates a Coordinate Mapping System Every hole within the grid corresponds to a specific coordinate. During ultrasound imaging, physicians identify the target location inside the prostate and match it with the appropriate grid coordinate.  This allows every needle position to be documented accurately throughout the procedure. The coordinate system also enables: This structured mapping is one of the reasons template-guided procedures have become widely adopted in prostate brachytherapy. 3. Improves Seed Placement During Brachytherapy In prostate brachytherapy, radioactive seeds or temporary radiation catheters must be placed exactly where the treatment plan specifies. The brachy grid ensures needles enter the prostate at the planned locations, helping clinicians distribute radiation evenly throughout the gland while minimising exposure to surrounding structures such as the urethra, bladder and rectum. Accurate seed placement contributes to: Research published in Radiotherapy and Oncology has consistently shown that implant accuracy is a major factor influencing successful prostate brachytherapy outcomes. 4. Supports Transperineal Prostate Biopsy Beyond brachytherapy, brachy grids are increasingly used during template-guided transperineal prostate biopsy. The grid allows systematic sampling of the prostate by guiding biopsy needles through predefined locations. This approach offers several advantages over traditional transrectal biopsy: Current European Association of Urology (EAU) guidelines recognise transperineal biopsy as an effective approach for prostate cancer diagnosis, with growing adoption worldwide. 5. Enhances Procedure Reproducibility One of the biggest advantages of a brachy grid is consistency. Every procedure follows the same coordinate system, making results reproducible regardless of operator experience. This standardisation is valuable for: Standardised needle placement also helps reduce variability between procedures. 6. Works Together with Ultrasound Imaging The brachy grid is not used independently. It functions alongside: The ultrasound provides real-time visualisation of the prostate, while the stepper maintains stable probe positioning. The brachy grid translates the ultrasound image into physical coordinates, enabling clinicians to guide needles accurately to the intended target. This integration forms the foundation of modern image-guided prostate interventions. 7. Helps Protect Surrounding Structures Precise needle placement reduces unnecessary trauma to surrounding tissues. By following planned needle paths, clinicians can better avoid important structures including: This contributes to safer procedures while supporting treatment accuracy. 8. Improves Workflow in the Operating Room A brachy grid also improves procedural efficiency. On the stepper system, the grid provides a stable reference throughout the procedure. Instead of estimating needle positions repeatedly, clinicians simply select the appropriate coordinate. The benefits include: These workflow improvements become particularly valuable during complex HDR brachytherapy procedures involving multiple needles. Why does hole spacing matter? Most prostate brachy grids use 5 mm spacing, although specialised applications may use smaller intervals. The spacing has been developed through decades of clinical experience and remains a key design feature of modern template systems. Uniform spacing allows clinicians to: Conclusion The brachy grid is an essential component of modern image-guided prostate procedures. By providing a precise coordinate system for needle placement, it improves the accuracy of brachytherapy, supports systematic transperineal biopsy, enhances procedural consistency, and helps protect surrounding healthy tissues. When combined with a stepper stabiliser, ultrasound imaging, and appropriate treatment planning, the brachy grid enables clinicians to perform prostate interventions with a high degree of precision. As prostate cancer diagnosis and treatment continue to evolve, the brachy grid remains a cornerstone of safe, reproducible, and effective prostate care. FAQs

Low-dose rate (LDR) brachytherapy is a method of delivering radiation at a rate of less than 2.0 Gy/h by placing sealed radiation sources directly in or near the treatment area. In plain terms, it is an internal form of radiation therapy; “brachy” comes from the Greek word for “short distance,” reflecting that the radiation source is placed very close to or within the tumour itself.  What is LDR Brachytherapy? LDR brachytherapy is a type of internal radiation treatment used to treat localised prostate cancer. During the procedure, tiny radioactive seeds are placed directly into the prostate gland, where they slowly release radiation over time. Since the radiation is focused directly on the cancer, it can destroy tumour cells more precisely while helping to protect nearby healthy tissues, such as the bladder and rectum.  This treatment is considered minimally invasive and is usually completed in a single procedure, allowing many patients to return to their normal routine more quickly compared to surgery or several weeks of external beam radiotherapy. LDR brachytherapy is also known for offering good long-term cancer control outcomes, while helping many men maintain better urinary continence and sexual function than some alternative treatments. Unlike prostate removal surgery, which completely removes the prostate gland, brachytherapy treats the cancer from inside the body without major incisions. It may be recommended for men with localised or low-to-intermediate risk prostate cancer, depending on their overall health and cancer stage. How does LDR Brachytherapy help treat prostate cancer? Low-dose rate (LDR) brachytherapy, often called seed implantation or prostate brachytherapy, is a form of internal radiation treatment used for prostate cancer. The procedure involves placing tiny radioactive seeds directly into the prostate gland, allowing radiation to target the cancer more precisely while limiting exposure to nearby healthy tissues. As the treatment is minimally invasive, it does not involve major surgery, and most patients only need a short hospital stay, often returning home the same day or within 24 hours. Recovery is generally quick, with many men resuming their normal daily activities within a few days. LDR brachytherapy differs from external beam radiotherapy (EBRT), where radiation is delivered from outside the body using high-energy X-rays. In EBRT, the radiation must pass through surrounding tissues before reaching the prostate, which can sometimes affect nearby healthy areas. In contrast, brachytherapy delivers radiation from inside the prostate itself, helping concentrate treatment directly on the tumour site. What is the procedure? Before undergoing LDR brachytherapy, patients usually attend a consultation with an oncologist to prepare for treatment. Depending on the hospital, this planning appointment may take place a few days or weeks before the procedure, while some centres complete the planning on the same day as treatment. At this stage, doctors may use imaging techniques like ultrasound or MRI scans. It helps in providing a more detailed view of the prostate gland. These images help the medical team identify the exact location of the tumour and calculate the most suitable radiation dose for treatment. The procedure itself is carried out under either general anaesthesia or spinal anaesthesia. Small radioactive seeds, each roughly the size of a grain of rice, are carefully placed into the prostate through fine hollow needles. Ultrasound guidance is commonly used throughout the procedure to ensure accurate placement of the seeds. The needles are inserted through the perineum, which is the area between the scrotum and the anus, and removed once the seeds are positioned correctly. LDR brachytherapy is typically completed within about an hour. After recovering from the anaesthetic, most patients can return home later the same day. A follow-up CT scan may be arranged within several weeks after treatment to review the placement of the seeds and assess the treatment plan further. The implanted seeds remain inside the prostate and gradually release radiation over several months. This targeted approach helps destroy cancer cells while reducing exposure to surrounding healthy tissues, allowing many patients to continue with their normal daily activities with minimal disruption. Who is suitable for this procedure? LDR brachytherapy is often recommended for men with localised prostate cancer, meaning the cancer is contained within the prostate gland. It may be suitable for patients with low-risk or intermediate-risk prostate cancer, depending on factors such as: In some cases, LDR brachytherapy may be combined with other treatments, including hormone therapy or external beam radiotherapy. A specialist will assess whether the treatment is appropriate based on each patient’s individual condition. What are the benefits? LDR brachytherapy offers several advantages for suitable patients, including: The procedure does not involve major surgical incisions, which can reduce recovery time and hospital stay. Radiation is delivered directly into the prostate, helping reduce exposure to nearby healthy organs and tissues. Most patients return to normal daily activities within a few days following treatment. Many men are discharged on the same day as the procedure or after a short overnight stay. LDR brachytherapy has demonstrated strong long-term outcomes in appropriately selected patients with localised prostate cancer. Compared with some other prostate cancer treatments, many patients experience lower rates of urinary incontinence and preservation of sexual function. What are the possible side effects of LDR Brachytherapy Although LDR brachytherapy is generally well tolerated, some side effects may occur during recovery. These can include: These symptoms are usually temporary and often settle down as time goes on. However, patients should contact their healthcare team if symptoms become severe or persistent. LDR Brachytherapy vs External Beam Radiotherapy (EBRT) Both LDR brachytherapy and external beam radiotherapy are used to treat prostate cancer, but they deliver radiation differently. In external beam radiotherapy, radiation is directed at the prostate from outside the body using high-energy X-rays. The radiation must pass through surrounding tissues before reaching the tumour. In contrast, LDR brachytherapy places radioactive seeds directly inside the prostate. This allows radiation to target the tumour more precisely while limiting exposure to nearby healthy structures. Another difference is treatment duration. External beam radiotherapy often requires multiple hospital visits over several weeks, while LDR brachytherapy is usually completed